Engine still skips on 1996 gmc truck already replaced spark plugs wires cap and rotor?

Answer 1

you never said fuel filter. or if service engine soon lite is on.try filter if problem persists check compression if ok possible pickup coil and or control module.mybe its my mistake but is ses lite on if not it still comes down to air fuel combustion. back to the gap of the spark plugs. are the wires a good brand same with dist cap and rotor check all before if you bumped the dist. very unlikly unless you loosened the hold down bolt.is the dist a nondisturbed type or disturbed ? that's a timing issue ok.

Answermake sure your distrubutor didn't get bumped and is causing crossfiring,just went through that and it will cause SES codes that aren't necessarly true.truck would sputter and sometimes backfire at low rpm's.you need a special diagnostic tool to acuratly set the distributor that displays the degree of the camshaft,i believe there's a mark on the underside of the dist. and a mark on the intake manifold to show if they are set right,but what i did was loosen the hold down bolt on the dist. and turn it all the way to the left that it would turn.then i would just bump start the ignition and then turn the dist. just a hair until i got it to where it would fire up with just the slightest bump on the ignition.there may be a better way to do it without the scanner tool but that worked for me.hope it helps.