1999 AUDI A6 avant 2.8L quattro. Car vibrates violently when accelerating between gear changes. Not engine problem. Seems to be gearbox related.
Check your ignition coils. I had the same problem on my 2002 Audi a6 3.0 quatro. Tiptronic transmission. I was driving down the road and all if the sudden the car started vibrating violently to. I thought I had a flat tire so I pulled over and checked but there was no flat tire. The more I accelerated the more it would vibrat. Changed my ignition coils and the problem went away.
Bent flywheel
This is a manual transmission? If so the clutch probably needs to be replaced. When you say "VIOLENTLY" what is going on, what is the road speed, what are the RPMs at? The more specific information the better. And this problem ONLY occurs between gear changes, right? The other times, everything is normal?
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