Percolation? Heat soak? Don't drive during summer??

Phreakish said

I really think this is related. If the tach does it, disconnect the tach. If not, then I bet the ecm has issues.

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I agree. I cannot believe he hasn't done something about that yet. It's been like this ever since he got it running. I would put another ECU and coil on it. Period. Somethin's up with that crap.