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Q: lack of power while driving on 2006 Chevrolet Uplander

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
lack of power while driving with pedal to floor will not go any faster
(1) Answer
Could be so many things it would be foolish to speculate without being able to do some basic diagnostic tests. Has the Check Engine/Service Engine Soon light been on? If so codes will be stored in the computer of your car that will indicate where the problem is, (you need a scan tool to retrieve the codes). You could have a lack of fuel pressure or a restricted catalytic converter hard to say.