Q: relay issue on 1994 Cadillac Eldorado

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Hello I`just purchased a Cadillac Eldorodo, I really it my service engine lgiht soon comes on and sometime my car stalls out at a light and starts right up I'm assuming it a relay but not really sure which one can someone advise.
(1) Answer
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I would start with pulling the trouble code.On Caddilacs you can jump the a and b terminals with the key on and count the flashes(code 12 is normal it will show 3 times and then the fault code.Or in the climate control hold the off and warmer buttons in with the key on and it will self check and give you fault codes.This is the first step.The trace out the fault code if it seems related to your problem.