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Just replaced engine on 1999 pontiac grand prix;I've got a real rough Idle,then it stalls. And the coolant light keeps coming on.

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  • Steve Allison
    Steve Allison May 11, 2010

    You haven't really given us much to work with.
    Was this a used engine? 
    Rebuilt?
    Is the coolant level low when the light warns?

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Vaccum leak?

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