Question about 1999 Pontiac Sunfire

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We've replaced the MAP sensor and coil pack in my daughters 1999 pontiac sunfire. It's a 2.4L, DOHC but the engine is shaking when it idles. We think it may have a broken motor mount, but when the engine is reved up, the shaking stops. We do hear an occasional puttering sound when it's idling. What else should we check?

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Do a compression test of the cylinders, could be a burnt valve, from what you describe engine is missfiring on idle and running on all cylinders at higher revs

Posted on Apr 24, 2010

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