rough idle

Asked by Doug Sep 26, 2012 at 09:53 PM about the 1998 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

i have a 2.4l twin cam. it runs rough and "coughs" thru the air filter housing. the last time it did this it acted like it ran out of gas and coughed. i now have a white powder substance on most of the engine. it restarted an now it will not go over 45mph. would some one please tell me what could be wrong with it. i dont know what to look at.

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