A charging system issue and/or a bad battery can cause all kinds of havoc.

I would start off with a load test of the battery and make sure the alt. isn't putting out too much AC voltage. Set your dvom meter to ac on a low scale and test across the the battery terminals with the engine running, anything more than .5 to 1.0 ac volts is reason for concern.

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"I was a dirty bird, Carol's not grungey - she's *****in" John Milner....American Graffiti