Q: My car bucks when I step on the gas pedal, even in park. It acts like it's not getting fuel, at idle it runs smoothly.

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was stumbling on and off at accelration for awhile now it bucks when i try to speed up will cruise at about 55 fine if i try to give it gas it bogs down and shacks , at idle it runs smooth , if its in park at i push pedal to the floor it has no power either , tonight the check engine light flashed , it also seems to want to run hot when i try to get it to go faster , it is a 2004 gran prix 6 cylinder .

My car has 250000 miles.
My car has an automatic transmission.

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