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Wrenchbender Ret · 12-10-2010, 06:57 PM

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.

12-10-2010, 06:57 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Back firing and Missing Please help 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.