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Its a 88 k3500 4x4 with the 454 tbi and when i bought it it sat for two years.I have replaced the fuel pump, distributor, coil, cap, rotor, plugs wires.pretty much everything for a basic tune up and since i got it it seems like its gradually running worse and worse ive messed with timing numerous times hoping thats all it was but ive tried every position it seems like its not firing right and its running rich.it sounds like it idles a little high and it has good power when you first take off but as soon as you gas it it falls flat on its face and doesnt accellerate.I have ran out of ideas somebody told me it could be my knock sensor but i cant even find one on my motor and the guy at advance said it doesnt have one so idk.somebody please help me!
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