ive got vibration in high gear around 55+mph. as i hold the pedal down it gets louder and rougher. seems to let up a little around 70mph. but as soon as i let off the gas its smooth like nothins wrong. at idle it sounds good. starts up and runs great just that vibration is killing me. the truck only has 52k on it. took it to a dealer had the codes read and they said injector #7 was shot so i replaced it along with new fuel fliters but that didnt help.... Any Ideas??
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