Hey guys i have noticed that my engine is vibrating and feels very rough under certain circ's its smooth as until 5,500rpm then it gets noticably rough through to redline. This happens on low and high boost... feather touch, gentle, mild and hard acceleration. I dont think its detonation due to it happening in all possible instances where im not pushing the engine too hard either. after completing a search i'm thinking its either: 1)The harmonic balancer (stock ud pulley) isnt balanced that well or 2)Worn engine mounts does this sound correct or am i way off?
