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  1. #1

    Default 2000 GMC 4.8L Codes PO300 & PO351,2,3,4,5,6,7,8!!!!

    New here, Hi to all. I've replaced the following with no luck.....coils, wires, plugs, fuel pressure regulator. Fuel pump press at the sending unit is 60+ lbs. Don't have a tester for the fuel rail yet. Motor starts right up but has a miss, checked all plugs with a ign tester, all fire the same. Sprayed ether on the intake change. EGR seems to be free. Unplugged chqange. Seafoam in tank...nothing either. Any ideas?? Thanks in advance, Mitch.

  2. #2


    Fuel pressure @ the fuel rail is 46 at idle and 55 with the hose off of the fuel press regulator( which is new NAPA). Injectors measuring 12.8 Ohms.

  3. #3


    P0351-p0358 is the coil packs code.. so it could be a bad ground wire.
    2000 ECSB Silverado 2WD
    LQ4 with Isky 215 Turbo Cam
    4L80E KB Racing S475 Turbo Kit

  4. #4


    Finally fixed the missfire......INJECTORS! Now when ever I start the truck after about 2 minutes CEL is on and 0351-8 is the code. Truck doesn't even have to be running. I clear the code, shut it off..turn the key on several times leave it on a few seconds and there it is....0351-8. Would the truck still run OK with a bad ground? Thanks.

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