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I have a 1990 Audi 80 quattro and have had several problems

1)Sluggish response around 2000-3000 rpm
2)Unable to hold idle

Based on responses from this list I have now replaced:

fuel Filter
O2 Sensor
Idle Stabilization Valve
Air Filter

and cleaned the injectors

It appears as if the idle problem is solved, but the sluggishness
remains.  Help!

Before I purchased the car in December, the PO had replaced the entire
ignition system (plugs, wires, coil, etc.) It has been tuned up. Once it
gets out of the 2-3ooo rpm range it runs fine, it starts fine . . . ????

Help, Help

90 80q 5spd