Question about 1996 Pontiac Grand Am

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I have a Grand Am, manual trans. quad 4, with 137,000. Having a problem with bucking sometimes on take-off or driving and try to accelator and it bucks. Have done the following things..new air filter,plugs,fuel filter,new spark tower and new boots, new oxygen sensor. fuel injection cleaner..NOT SHOWING check engiene light..have had diag. check showing no other sensors. Could it be a crank shift sensor, should it show up on diag check? Car will run fine for a few miles, seem like longer you drive the worse it gets, shut it off and will run fine for short time again...when problem starts rpm drop down to 800 or less..normally runs about 900.

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DON'T KNOW THAT THE CAUSE IS BUT 900 RPM IS WAY TOO HIGH FOR A NORMAL IDLE SPEED.
WHILE IT IDLING HOSE THE ENGINE WITH A MIST OF WATER AND LISTEN FOR A CHANGE IN IDLE SPEED OR AN ELECTRICAL SHORTING SOUND.
SHORTING SOUND = PLUG WIRES
SPEED CHANGE = A VACUME LEAK.

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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http://www.autozone.com/addVehicleId,2144602/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800bca0b

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