alright i called the dealer today to get an appt for my a piller rattling again. also my truck has been a little sluggish this past week, do u think it is do to the cold? what happens is when i hit the gas it will go up in rpm's wait a sec and then shot up and take off, i tried it when the truck warmed up, i figured that with the engine warm it should still take off even though is like 2 fing degrees outside, is this what heppens when the heads r bad or going bad. a little insite would be great thanks all sorry so long