I think is power related (alternator/belts etc.) It the car is not getting enaugh charde all the electricarls start going crazy; gauges start missfunctioning, even the radio goes off, CD's start to skip etc...So check power first, if not check vacume leaks, E30 are very sensative to vacume leaks, even if you take off the oil cap or dip stick off, the car will run like shit....
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