Many electrical issues are intermittent on cars and it drives people crazy. Try cleaning the main ECM ground, which may be located on the thermostat housing. Also, remove and clean the Back-up Fuse, located in the under hood fuse box. It's always good to test all under hood and under dash fuses with a test light or multimeter, when you are experiencing electrical problems. It may give you a tip of where the problem is coming from. Finally, I would check the ignition switch for wear, pitting, or melting.
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