My truck misfires and will runs rough and only wants to go up to 40mph/usually am/intermittant


Asked by Jan 27, 2013 at 06:39 PM about the 2006 Dodge Ram 1500

Question type: Maintenance & Repair

past had a failure code P0304 , cyclandor #4  misfire
we have replaced spark plugs, coil and fuel injector
Any other ideas as to what the problem is?

23 Answers


Wow, have you considered it to be more than just a misfire on cylinder 4? It could be a fuel delivery problem to the whole engine. Also, are you SURE that you are working on cylinder #4? Check and double check again. What engine does it have? I'll get you the cylinder numbering. Also, can you feel a noticeable misfire while the engine is just idling in park?

12 out of 12 people think this is helpful.

Do a compression test on all cyls this will locate the problem child, a valve w carbon stuck on the valve face will set the light,if you also have back fire it indicates a valve is open upon firing, possible burn valve may be the culprit, this would create a constant runnabilty issue. (Misfire) good compression numbers gas engines 120 - 180 psi diesel 250 - 300 anything below this range will not fire or balance the engine.

6 out of 6 people think this is helpful.

Hope that helps

Also low fuel pressure can give similar symptoms

3 out of 3 people think this is helpful.

joef-The engine is 5.7 liter HEMI. Yes, it misfires while in park. tommcmanis-I have not tried the compression test yet. Thanks

3 out of 3 people think this is helpful.
Curtis Baggett

How many miles are on it? What maintenance has been done? What happened when this issue started?

1 out of 1 people think this is helpful.

87,000 miles. Maintenance-allways oil changes. Truck shaked and did not run faster than 40mph. Now it runs rough/misfires and tends to stop after the engine light goes on. The worst is in the morning. Sometimes during the day.

9 out of 9 people think this is helpful.

TPS throttle position sensor

6 out of 6 people think this is helpful.

I have a 2003 Dodge 1500. Same code replaced all the plugs and coils. After doing that and a lot of online research I removed my valve cover and found my rocker arm was thrown. It is a common occurrence in the 4,7 v8. Once you replace what the Dodge manual calls a lash adjuster and putt the rocker arm back in your error code should go away. The rocker arm thing is a common thing with the this engine and usually occurs on cold start up. Try running some fuel cleaner and or engine cleaner to clean build up. Good luck

6 out of 6 people think this is helpful.

The engine light flashing on and off is what my truck did and it will drive rough and will not drive over 40. If you can help it do not drive it due to damage it can cause to your catalytic converter.

8 out of 8 people think this is helpful.
Andrew Davis

I have a question for fresnonittanylion559??? Im have similar issues and have replaced all my plugs, wires, distributor, and rotor... I have a 5.9 v8 I have not removed my valve cover to check, but im also not getting any pecking sounds from the engine, just misfire and issues going over 50?

13 out of 13 people think this is helpful.

I am currently having the same issue with my 2004 Dodge Ram 4.7. Did you get your problem identified and resolved?

10 out of 10 people think this is helpful.

I have a 2012 ram 5.7, #1, missfire and sometime 2, head has been change, coil; plugs, lifters, pcm , fuls system good, still missfires

13 out of 13 people think this is helpful.

Thank you for the info, it's got to be something that is common on the ,5.7 Hemi, but I can't find anyone that can pinpoint it. My truck miss fires when cold, I can stop and restart, and runs fine the rest of the day, strong and smooth, next morning it all starts again, sputtering and back firing. It has two hundred and fifty two thousand miles on it, never had a minute of trouble, until now. Compression is good, fully maintained always. Love my Ram….

18 out of 18 people think this is helpful.
Jason Steele

My 2003 Ram 1500 hemi 5,7 just started doing the same thing. It did it a few years ago and it wound up being a broke exhaust valve spring. Hoping that's all that's wrong now..

2 out of 2 people think this is helpful.
Troy Bowen

My 97 Ram w/5.9 was doing same thing. Fixed plenum ,changed cap ,rotor, plugs and plug wires. Still misses at idle and can't use overdrive cause it misses so bad. I pulled the fuel injectors and cleaned them with B12. There are some how to videos on you tube. Truck runs great now. 196954 miles on it!

2 out of 2 people think this is helpful.

i have a 98 dodge ram SLT 1500 318 5.2L i changed all senser all dash light went off but still missing so i check the spark plug magnum engine use plug number RC12YC NOT PLUG NUMBER ON TRUCK


I got a 2009 dodge ram 1500 5.7 hemi I put new cats on 2 coil packs and crank senior and still have a misfire on 5 and 6 what could it be ?

1 out of 1 people think this is helpful.

And new plugs

Veronica Knight

I have a 03 dodge ram 1500 4.7L and it started back firing saying I have miss fire on injector 8 and random misfire then my truck started dying while I was driving down the road... I got injector 8 fixed put new o2 sensor in bank 1 sensor 2 put new crank shaf sensor and clean the cam shaf sensor and fuel treatment (injector cleaner) in my truck before it started acting right again Good luck

2 out of 2 people think this is helpful.

I have an '06 Durango, 5.7 Hemi that had a rough idle/misfire on every cold start that would last for about 2min then go away. Mechanic thought it was a sticky valve. After some investigating, it turned out that it wasn't. Mechanic looked at both O2 sensors. Misfire was on one side of motor. Changed O2 sensors around, then misfire showed up on other side. O2 sensors suspect, then replaced and so far car starts fine. Only been a couple of days though. So far so good.


Be sure fuel filter is replaced on regular schedule. Improper fuel pressure will cause injectors to not perform properly.


i have 03 2500 ram with 245 thousand miles. sparks are coming out of the coil's and alternator and i have a mis fire on cylinder 5, and my volt guage is lower than half.i put new sparkplugs about a month ago still cant figure it out what can be wrong?

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