89 80Q odd reving

[Ti Kan]

JagerBond at aol.com writes:
> New O2 sesnsor and the car passed smog, finally!  Downside, when I rev the
> car up, then let off the gas the revs drop to 100-200 for a second, a couple
> of idiots lights come on and then back to normal idle at around 800RPM.
> Sensor issue?

Throttle body idle switch making good contact?  Idle stabilizer valve
needs cleaning?

-Ti
2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
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