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That is most likely antifreeze (coolant) leaking into your engine. It is not oil because it is blue smoke. This means you need to replace a gasket somewhere, most likely one of the head gaskets. If you keep driving it, it will begin to knock, and ultimately, your engine will seize or just pop.

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Q: My 1989 Chevy caprice shuts down when at a light or stop sign engine idle is up and down and white smoke is coming out of one tailpipe i have dual exhaust. What is wrong with my car?
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