80q engine quandry

[TooManyAudis at aol.com]

Hey guys,
 
I drove my 88 80q about 60 miles today.  Washed it in a car wash and  hit the 
top of the engine are up with the hose to clean off some grease  /  dirt.  I 
do this whenever I clean the car (every 6 months or so)  and there was no 
problem restarting.  I drove another 15 miles with  absolutely no issues.  In 
fact, I was thinking to my self that my 275k+ car  was running pretty darn well...
 
Stopped by Publix supermarket for a few things on the way home, and when I  
restarted my car, it searched for idle, revving between 1000 and 1100 rpm.   
hitting the gas would briefly blip the revs (up to say, 2200 or 2500) then  it 
would fall immediately down to the 1000 to 1100 rpm mark.  unplugged the  ISV 
with no change.  took off the distributor cap -- no water, and no  difference 
when I put it back on.  
 
Fuel pump working fine, and no difference when terminals jumpered.
 
No visible vac leaks, and engine stalled when I opened the oil cap.
 
Any ideas as to what I need to check?  
 
Thanks,
 
Tom



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