Poor running 90Q

[David Ellis]

Hi Gang

I just got a 1989 Audi 90Q 10V.  It had been sitting a while, so I changed
the oil/filter and spark plugs and cleaned out the ISV, put a fresh tank of
Super unleaded and a new battery.  Everything looks OK, & engine cylinder
compression is good on all 5.  The car will start and run but idles very low
and when you rev it up it sounds like it is missing or not running on all 5
cylinders.  And it is hard to get it to rev over 3500 RPM in neutral.
Needless to say it does not drive well at all, you have to slip the clutch
just to get it up the driveway.

I checked all the fuses, especially the ones under the red cover that say
"MOTOR-MOTEUR" which I believe powers the ECU

Any other ideas on what to check?

Thanks for any ideas!!

David E.