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I have a 99 Pontiac Grand am Gt 3.4l ...everything And I mean EVERYTHING from heads up including heads, all fuel system components,All sensors and even computer has been replaced with remanufactured one. Car starts and idles perfect ....As you start to drive will stumble,miss and almost stall ...release throttle goes back to smoothidle may do this once or several times .Once above 2000rpms car runs fine .Sometimes down shifting to lower gear (it is Automatic)will lessen problem ....I am at my wits end ...Dont want to sell car but have invested much money ....Also no check engine lights ....Anyone have any fresh ideas