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Hi
A4 2.8 manual 1996
I did change coils sparks and some cabling, cleaned IVC and Throttle body. however this problem is simply killing me I already took it to two car shops and both of them charged me for stuff and told me it is fixed while it is not.

This happens randomly but normally it does not happen in the morning. While the car is idle in a traffic jam the RPM starts to fluctuate wildly between 200 and 1000. Another thing that happens sometimes and might or might not be related is that sometimes when the rpm is 1500+ and I press the gear clutch it stays at 1500 for roughly 5 seconds before dropping back to 1000 and then it stays there a couple of seconds before dropping to 800..

Any hints please ?
 

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sometimes it can be a vacuum leak too mate. Id check the maf, and also any of the vacuum hoses on the throttle body. If they have cracked or split it will give the exact same running behavior. has anyone checked vagcom for u mate?
 
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