Quote:
Originally Posted by billybronco1
Only one real black one out of the 8
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That is the same symptom I just tracked down on the "Missing at Full Throttle" thread. Turned out to be a broken connection in the spark plug cable to cylinder #2. With the engine at idle pull any other spark plug wire off and listen for the slight RPM drop. Put that wire back on and pull the wire from the offending cylinder; it will probably not affect the RPM, indicating that cylinder is not firing.
Check continuity of the spark plug wire from the distributor end to the plug end. If you are using solid copper plug wires it will read near zero Ohms. If you are using carbon core wires (bad idea) or spiral wound wires you will find resistance of up to 4,000 Ohms per foot.
And clean or replace the black plug.