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


Asked by Aug 02, 2014 at 11:00 PM about the 2006 GMC Sierra 1500 SLE1 Crew Cab 4WD 5.8 ft. SB

Question type: Maintenance & Repair

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. Been to car dealer shop threes and not fixed yet.  They say it
might this or that but it cost me every time I take it in.

1 Answer


After taking it to dealership one I took to twice couple thousand dollar later. I took the engine apart . I found 4 lifter that were shot and a cam shaft that look like it had been on grind. One bad value and a broke spring. Make you wonder who works at these dealship. Now what to fix it buy new engine. KEEP IN MIND I HAVE PUT OVER A COUPLE THOUSAND . NEW ENGINE 3500 to 4500. I read this engine are bad for bad cam breaking and thing like this. Sometime it better to go with your gut feeling. To save some money.

Your Answer

Add photo

Related Questions

  • Multiple misfires 3 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

  • rough idle, stalling, loss of power. 225 answers

    o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so. I don't think its the torqu...

    1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB


    Maintenance & Repair

  • P300 on vortec v6 why 6 answers

    I have a 1997 GMC 1500 with a 4.3 Vortec v6 it has a p 300 random multiple cylinder misfire code I have change distributor cap rotor button and distributor and plugs and wires cam sensor crank sen...

    1997 GMC Sierra 1500 C1500 SL Extended Cab SB



  • define engine codes 1 answer

    Code p300&p302 for a 4.7l what are these codes

    2005 Dodge Ram 1500 SLT Quad Cab SB


    Maintenance & Repair

  • P300 code, I have been getting a p304 code and have done the usual stuff. Plugs,ignition coil, plug wires. Car runs fine, shakes a little when at a stop but runs good otherwise. 3 answers

    Knocks when cold but gets quite when warm. Today I got a p300 code, now what? When I start the car it seems to lag when starting like its starving for gas. It does start, but just seems like it la...

    2005 Dodge Neon 4 Dr SXT Sedan


    Maintenance & Repair

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
Reputation 4,390
#2 John Saffrahn
John Saffrahn
Reputation 3,080
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,700
View All

Related Models For Sale

Used Chevrolet Silverado 1500"
2,429 Great Deals out of 143,996 listings starting at $1,995
Used Ford F-150"
3,163 Great Deals out of 216,428 listings starting at $1,000
Used GMC Sierra 2500HD"
150 Great Deals out of 15,314 listings starting at $1,900
Used Dodge Ram 1500"
513 Great Deals out of 13,857 listings starting at $995
Used Toyota Tundra"
617 Great Deals out of 26,460 listings starting at $2,500
Used Toyota Tacoma"
647 Great Deals out of 30,295 listings starting at $2,850
Used Chevrolet Silverado 2500HD"
388 Great Deals out of 33,674 listings starting at $2,998
Used Chevrolet Tahoe"
1,106 Great Deals out of 36,353 listings starting at $1,700
Used Ford F-250 Super Duty"
449 Great Deals out of 42,777 listings starting at $1,000
Used GMC Yukon"
537 Great Deals out of 14,694 listings starting at $1,500
Used GMC Sierra 1500HD"
8 Great Deals out of 128 listings starting at $3,450
Used GMC Sierra 2500"
223 listings starting at $2,895
Used GMC Yukon Denali"
26 Great Deals out of 4,665 listings starting at $7,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
19,495 listings starting at $20,851
2016 GMC Sierra 1500 For Sale
85 Great Deals out of 13,249 listings starting at $21,510
2015 GMC Sierra 1500 For Sale
192 Great Deals out of 4,705 listings starting at $15,995
2014 GMC Sierra 1500 For Sale
147 Great Deals out of 4,282 listings starting at $12,500
2013 GMC Sierra 1500 For Sale
93 Great Deals out of 2,651 listings starting at $12,400