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1999 Chevrolet Malibu Question: My 99 malibu stalls and is knocking faster It idles the louder it taps.

 

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Goldie49g, Potwin, KS, August 24, 2013, 16:53
 Rookie

It will start and stall after few mins idling. Sounds like a tapping the higher it idles the faster it taps and I saw puff white smoke come from the valve cover as it stalled. Was thinking bad valve cover gasket and oil on spark plugs. Has been very reliable car until just recently. Now stalls sometimes when it's put into gear. Not sure what to start with!

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