hey i have had this problem for the past year and spend thousands trying to fix it but no luck!

The problem is that i get like a shake,gutter in 1st 2nd and 3rd gear, normal happens at the same rpm in each gear. Also it would happen when i let go of the accelerator and press it again while the car is under load! i changed my vacuum hoses, new air flow meter, new gearbox oil, new ignition leads. I think it could be clutch slippage? any Ideass?

Also i am not sure if this is related but while cruising on the freeway doing a steady 100km/hr if i would total let go of the accelerator the revs would drop then rise and drop and rise untill i apply my foot to the throttle again, its really wired!

B5 v6 2.8L tiptronic

Please any help would be really appreciated

Cheers