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91 buick starts when cold but warm runs terrible?

3.8 motor,starts and runs ok, after shutting off for a half hour will start and run terrible. wait an hour to start and it starts and runs good again.
danny, March 2007
1.Check coolant.
2.oil type/right level.
3.radiator is not working properly.

Joel harris, August 2007
link Click here to see other fixes for Buick.