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Make sure you have a good engine to chassis ground. Most of the time they are connected from the valve cover to the car body and easily visible with the hood open. Clean the connections even if the wire is connected, if not that is probably your problem.
Take a DVM and check for bad connections from the battery to various points on the car, both positive and negative circuits. When-if you find any voltage reading above .10 Volts that will be the portion of the circuit where you have a marginally bad connection.
regards
Mech
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