1999 gmc sierra sle 4×4 5.3

My check engine light is flashing, it has a miss awful throttle response, you can smell fuel from the exhaust and when the code is ran it shows it has a random misfire I have changed the spark plugs, plug wires and coil packs, could it be the spider injector or a crankshaft position sensor. I don’t want to keep throwing money at it hoping it will fix it. Please help

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1 thought on “1999 gmc sierra sle 4×4 5.3”

  1. Freeautomechanic

    If the check engine light code is still on with a misfire I would check the plugs again and see if one of them looks wet, if so I would swap one of the injectors to see if the wet plug moves along with the injector. If so, replace the injector. If not start checking the compression to rule out a blown head gasket.

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