Hello am new here and have the following problem! Have a 90’s Quattro;2,3l NG;98KW! Have such a kind of load change stroke when gasing and take away the gas! Have already made new engine bearings, gear bearings and rear axle bearings but has not got better! Have another cardan shaft installed since the center bearing was not good anymore! What else could it be the problem?Hinterachsdifferential or gear shaft main shaft? Hope you can help me!