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2004 GMC Sierra 2500 HD Question: what causes my truck to lose power and start to air pocket.

 

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snarfer, 8.1L V8, Crownpoint, NM, April 02, 2014, 09:10
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u turn on the vehicle put it in drive, about a mile into driving it starts to lose power and u have to slowly release gas peddle until it catches speed, but as soon as u try to push in gas alittle more, speed goes down and starts to air pocket and seems like it is choking. i was told it could be a sensor, but wouldnt know which one.

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