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Q:

WHY WEN I CUT MY LIGHTS ON AND MY HEAT MY CAR STARTS JERKING AND MISSING BAD.. on 1990 Cadillac Seville

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PUT ALTERNATOR ON IT PLUGS AND WIRE
(1) Answer
(1) Comments
Sounds like a groung wire has come loose to either the headlights or the heater. You need to track it down and get it reattached.