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Message: <blockquote data-quote="96blak54" data-source="post: 1585738" data-attributes="member: 14727">So you say the engine idles and runs great, but has a rough vibration at low rpm? And this vibration is very noticeable compared to how the car use to be?Some one correct me, but does te factory harmonic balance fail on the 5.0l after time? A fail balancer would explain vibration. The flywheel/flexplate are counter balanced as well and possible weights detached, but not likely. If it were me, I would investigate the balancer 1st. Pulling it off to inspect would be the easiest and doing so would probably reveal the failure. If im thinking right, age simply does them in.</blockquote>