Another possibility is stray EMF from your secondary ignition system or from the alternator. Quick check would just be to remove the control wires from the alternator and try that. I have seen anything over 0.2 VAC cause problems, but will definitely cause problems over 0.5 VAC. Having the wires from the sensors run close to your ignition coil or secondary spark plug wires can induce stray voltage also. Hang in there. If these things were easy, anyone could do it.
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