Multiple misfires

Asked by Apr 08, 2014 at 05:41 PM about the 2002 GMC Sierra 1500 SLE 4WD Extended Cab SB

Question type: Maintenance & Repair

truck will not go over 30mph when it does code comes up for multiple misfires and you
are unable to throttle down anymore. have checked everything for air leak. nothing comes
up. just replaces header gasket and exhaust manifold gaskets. code p300 keeps coming
up have also replaced fuel filter. believe it might be the fuel pump. any answers?

4 Answers

465

Maybe check your spark plugs too.

I have changed all spark plugs and wires.

465

Maybe your computer needs to be remapped.

1 of 1 people found this helpful.

1998 GMC Sierra 1500 SLE Extended Cab 5.0 Liter Engine. I have a similar situation. I replaced Coil and it's controller. spark plus, wire and rotor and rotor cap. Changed oil and etc. Air Filter also. I even replaced the distributor itself to be on the safe side. Mine gets the Error Codes P0102, P0108, and P1351 They may be the error codes from before me repairing all that. But I thought I cleared them back then. I just fired it up and it stayed running once until the engine heated up but before that if I did not keep my foot on the pedal it died. It can not go below 1000 rpm without chugging out so I have to keep it manually above 1000 rpm. I had a local mechanic friend of mine say he knew what it was. He said it was a fuel filter. But if that was the case, why did it start and run for a while and I mean a while and while it is running the tachometer readings kept jumping faster than and slower than I had it running. It feels like it misses also but I cleared the codes and it take a couple weeks to get the codes to come back and I can't drive it to get that.

Your Answer

Add photo

Related Questions

  • Multiple misfires 4 answers

    truck will not go over 30mph when it does code comes up for multiple misfires and you are unable to throttle down anymore. have checked everything for air leak. nothing comes up. just replaces heade...

    2002 GMC Sierra 1500 SLE 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Misfires 11 answers

    My trucks misfires when I drive it

    1995 GMC Sierra 1500 K1500 SLE 4WD Extended Cab SB

    -

    Maintenance & Repair

  • I have 2006 gmc 5.3 multiple miss fires on left bank. Code p300 1 answer

    Changed everything I can think of wires, plugs, manifold gaskets, injectors, Corel, lean gas tank, check for water in fuel. Sound like a valve in a old style motor. Check com press on head check ok...

    2006 GMC Sierra 1500 SLE1 Crew Cab 4WD 5.8 ft. SB

    -

    Maintenance & Repair

  • multiple random misfires 4 answers

    Ok...Hopefully someone will be able to help. I have been getting p0300 codes coming up on '01 Chevy Express 3500 (5.7 litre) over the last week. It only throws the codes while I'm idling. I have check...

    2001 Chevrolet Express G3500 Passenger Van Extended

    -

    Maintenance & Repair

  • Cylinders misfiring 7 answers

    Cylinders randomly misfires when hot. Manifold gaskets, fuel injectors on the odd number cylinders, M.A.F. sensor, crank shaft sensor, spark plugs, and O2 sensor were replaced. The funny thing is, a...

    2003 GMC Sierra 1500 SLT 4WD Extended Cab LB

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 69,764 nationwide Sierra 1500 listings starting at $1,800.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 5,100
#2 John Saffrahn
John Saffrahn
Reputation 3,560
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,240
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,827 Great Deals out of 182,478 listings starting at $1,595
Used Ford F-150
2,064 Great Deals out of 208,242 listings starting at $290
Used GMC Sierra 2500HD
112 Great Deals out of 13,288 listings starting at $2,650
Used Toyota Tundra
437 Great Deals out of 34,764 listings starting at $1,991
Used Dodge Ram 1500
428 Great Deals out of 10,968 listings starting at $1,000
Used Toyota Tacoma
501 Great Deals out of 42,066 listings starting at $1,995
Used Chevrolet Silverado 2500HD
271 Great Deals out of 28,146 listings starting at $2,500
Used GMC Yukon
393 Great Deals out of 20,076 listings starting at $2,495
Used Chevrolet Tahoe
586 Great Deals out of 32,534 listings starting at $1,500
Used Ford F-250 Super Duty
326 Great Deals out of 46,197 listings starting at $599
Used Chevrolet Camaro
245 Great Deals out of 31,897 listings starting at $1,000
Used GMC Sierra 1500HD
5 Great Deals out of 116 listings starting at $2,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
58 Great Deals out of 46,162 listings starting at $22,888
2016 GMC Sierra 1500 For Sale
83 Great Deals out of 3,539 listings starting at $17,671
2015 GMC Sierra 1500 For Sale
99 Great Deals out of 4,080 listings starting at $15,990
2014 GMC Sierra 1500 For Sale
102 Great Deals out of 4,201 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
58 Great Deals out of 1,944 listings starting at $8,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.