Quote:
Originally Posted by Gaz64
A faulty tachometer will cause your issue, especially if the needle still moves with the signal wire disconnected.
Don't discount a tachometer as the cause for intermittent spark.
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The tachometer needle does bounce around with the engine running even though the signal wire is disconnected. I keep thinking the tachometer is a clue, but without a direct connection to the distributor I don't see why. It is an electronic tach from Speed Hut. The engine still runs rough with the signal wire disconnected.