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Old 09-23-2012, 11:50 AM
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Do a cylinder balance test using a manifold vacuum gauge to find the weak/missing cylinder.
Dis able the spark one cyl at a time notting the vac drop.

Remove the valve covers and watch the valves move. Bad cam bad lifter
Try a different distributor.
Install a ground strap from engine to body firewall. (this is a must with a HEI dis.)
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