Quote:
Originally Posted by Wrenchbender Ret
If it has a definit miss at idle you can pinpoint which cyl . it is by pulling plug wires one at a time. If it does not change when you pull a wire that would be the cyl. causing the problem. Use plastic pliers as that HEI throws a bolt of lightning & will get your attention if it bites you. If you narrow it down pull that plug & see if it has a buildup on it or is cracked. Pull the valve covers & make sure all the rocker arms are in place. Turn the engine over & watch that all the valves go up & down. I'm thinking you may have a bad camshaft.
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What happens when you floor it? If you get a "popopopop" through exhaut or intake it is a sure sign of something valve train related.. pulled stud, bent pushrod or bad cam/lifter.