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I am experiencing a vibration after my truck warms up at idle but not really when it is cold, when I first start it, it idles fairly smooth. As I go through RPM range it feels smooth. But while cruising at about 2000 RPM I can feel it. If I shift to neutral and coast it smoothes out until the engine reaches idle, and then i can feel the same vibration that I feel at Idle. I sort of suspect a harmonic balancer.
96 F250 7.3 Turbo.
Lift Pump is less than 1 year, new injector/glow plug harness pig tails, glow plugs, and valve cover gaskets.
This problem was there before I did that work.
I wasn't able to find anything that really seemed to be that similar to my problem searching the forum.