1990 Coupe Q brake failure light & idle.

[SaamG@aol.com]

Figures.  I answer a brake question, I get a brake problem!

My 1990 Coupe Quattro's brake warning light (no, not for the e-brake) comes
one and stays on after I start the car.  I back the car out of the garage,
and when I start to roll forward, it turns off.

About 2 months ago, I replaced the brake pressure booster at Steve Taub
Porsche Audi (extended warranty) and have had no problems until a week or so
ago when I realized that the warning light stays on a bit too long.

ALSO-  Steve Taub's brilliant mechanics were not able to reproduce a problem
that is now getting worst.  The car's idle is unstable and drops when I come
to a stop, especially during parking manuvers.  They said no vacuum leak, and
the idle stabilizer was changed about4 months ago (again, under warranty).
 The car now takes 2 cranks to start when it's warm and SOMETIMES comes close
to stalling after certain manuvers.

Any ideas?

BTW- I am seriously considering dropping another engine in this thing.  I was
thinking about getting the boxter, but have fallen for my car again.  260+
HP?!?!? 

ANY HELP, even an "I know how you feel, man" would be great.

Thanks-
Saam Gabbay
1990 Coupe Quattro
SaamG@aol.com