trouble starting in '86 5kcstq (HELP! More problems!!!)

[Pat Dooley]

I just fixed a problem similar to this yesterday.
Would floor the gas and hold down just get very erratic idle.  Would
fluctuate between 500 and 2000rpm while popping and backfiring into intake
boot.  I had to keep it floored with auto trans in drive just to stumble and
buck the car(86 5kt) up the driveway.
I knew the mixture was lean, but all hoses and boots were in good shape.
I couldn't check the fuel pressures because audi uses a different fuel
fitting setup than VW, my CIS pressure tester wouldn't fit.
I just figured the control pressure was too high, forcing the flow plate
down too low.
Well, I recalibrated the regulator(another story) to a lower pressure and
everything is fine.  Starts/runs/idles perfect.

Only thing bugging me is how the pressure got screwed up in the first place.

> To: quattro at audifans.com
> Subject: trouble starting in '86 5kcstq (HELP! More problems!!!)
>
>
> I really don't know what to do now.  I installed a new check
> valve in the fuel pump.  I went to start and now i have to floor
> the gas just to keep the engine alive, it won't idle.  If i let
> off on the gas, it will die and i will have to wait 10 min or so
> to have another successful attempt.  I don't know if there is
> just a lot of air in the system or something, but this is really
> killing me!!