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

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.

Asked by for the 2004 GMC Sierra 2500 HD
You're terminology is different then mine, do you have a check engine light on, get the codes and re-post the codes.
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sorry clicked wrong Question