Could be a couple of things. Did u run your RCA the same side as your power?

 

no i ran all power wires in another area. if one of the power wires is not a heavy enough gauge wire will that be the problem.

 

grounding problems possibly?

I've had this problem before as well as a few friends...might have something to do w/ "alternator whine", hence why it happens when you get on the gas. Check to make sure that your amp chassis aren't contacting the trucks chassis...don't forget to check that the alternator is properly grounded. Also make sure that the radio and amp grounds are good too. Let me know if that helps any, if not I'll see what else I can think up to check.