1991 Mazda MX-6 Questions

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It has what looks like an extension cord hooked up to a plug that it's connected to the engine Block i was told it was there to warm up the oil if you live in a cold climate please help
Blower works, fan works it just blows cool air
I cleaned the throttle body but it still does it i was told it may be the idle Aire control,
SHAKING AND SHUTTERING ON IDLE