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

475

Maybe check your spark plugs too.

I have changed all spark plugs and wires.

475

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

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 68,287 nationwide Sierra 1500 listings starting at $1,350.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,300
  • #2
    John Saffrahn
    Reputation
    3,670
  • #3
    Glenn Clingenpeel
    Reputation
    3,350
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,129 Great Deals out of 183,036 listings starting at $1,898
Used Ford F-150
2,234 Great Deals out of 183,024 listings starting at $1,500
Used GMC Sierra 2500HD
100 Great Deals out of 13,281 listings starting at $4,450
Used Toyota Tundra
443 Great Deals out of 33,909 listings starting at $1,999
Used Dodge Ram 1500
413 Great Deals out of 10,669 listings starting at $1,500
Used Toyota Tacoma
568 Great Deals out of 42,381 listings starting at $2,999
Used Chevrolet Silverado 2500HD
320 Great Deals out of 29,162 listings starting at $2,650
Used GMC Yukon
419 Great Deals out of 21,028 listings starting at $1,495
Used Chevrolet Tahoe
642 Great Deals out of 36,955 listings starting at $1,800
Used Ford F-250 Super Duty
356 Great Deals out of 43,712 listings starting at $1,250
Used Chevrolet Camaro
419 Great Deals out of 31,911 listings starting at $2,395

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
84 Great Deals out of 39,232 listings starting at $23,314
2016 GMC Sierra 1500 For Sale
93 Great Deals out of 3,483 listings starting at $17,000
2015 GMC Sierra 1500 For Sale
118 Great Deals out of 4,556 listings starting at $15,922
2014 GMC Sierra 1500 For Sale
125 Great Deals out of 4,727 listings starting at $12,987
2013 GMC Sierra 1500 For Sale
46 Great Deals out of 1,978 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.