Help!! my car doesn't run right

[Ti Kan]

NineK at aol.com writes:
> I do all of the mechanical work on a Triumph Spitfire that I own. But my 
> wife's car is a 1988 Audi 90 with a 4 cylinder and automatic and I don't know 
> anything about it.
> The first clue. When I start the car the idle is really rough - it bounces 
> between 500 and 2000 rpm's - but it will idle.
> The next clue. When I put it into gear it is even rougher.
> And the final clue is that when driving between 30 and 60 mph and I let my 
> foot off of the gas the rpm's will not drop back down.  The engine will rev 
> on its own.

Check for vacuum leaks in the intake tract, post throttle valve where
any leaks would be unmetered.  Look at the big rubber boot that goes
from the throttle valve into the intake manifold, and all the hoses
attached to it, as well as those that go directly into the intake manifold.
This would be a good first step.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
96 A4 2.8 quattro (sold but not forgotten)
-- 
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
 //////  http://www.ibiblio.org/tkan/
///