Problem Audi 90 hitting the rev limiter

I have a problem with the audi 90, when driving on a straight the revs suddenly jump and into the rev limiter. If it happens it's around 6000 rpm and the rev limiting stops when I ease of the gas and the revs jump back to around 6000. Is this an intended quirk of the audi?

 

same here, like the clutch is slipping, you have to let off then throttle again to fix it.

i think its a bug, because its 100% not the wheels spinning.

 

It's a known issue - I think the fix will be in the next update.