86 4kq, idle problem (long)

[Kneale Brownson]

Did you try some gasline antifreeze?

At 10:59 PM 1/5/2004 -0500, Shaggs1996 at aol.com wrote:
>Problem started a few days ago.  Im gonna explain this the best I can, so 
>bear with me.  Went to go run errands, started car, car ran rough, 200rpm, 
>didnt 
>stall, but when given a decent amout of gas, car sounded like it was 
>backfiring (loud "boom" from engine bay).  After feathering the gas a bit, 
>the idle 
>evened out to 1000rpm, and I was on my way.  Same thing happened twice later 
>that 
>day after coming out of a store and getting gas.  Later the same day, after 
>the car sat for a while, I started it up and everything was merry, drove off, 
>car ran great.  Get to friends house, shut down, come back 2 hours later, car 
>stars awesome, and drives off great.  A few mins into the trip, car loses 
>power, and wants to idle at 200rpm again.  Im forced to pull over, and 
>rescure the 
>idle via my foot, again.  If I try and move the car when the idle is that
low, 
>the car of course doesnt wanna go, and lunges forward as the revs drop.  Car 
>gets going, and gets home fine.  I had time to look at it tonight, so after a 
>stuck ebrake, I pull the car into the garage.  Check some O2 sensor wiring, 
>pull the plugs, and check for vac leaks..nothing, everything there checks 
>out.  
>Fuel filters are a month old, fuel pump wiring is nice and dry, but there is 
>alot of ice under the car, and around the fuel lines.  I did pour in some
fuel 
>injector cleaner tonight as well.
>Thats where I stand now.  Car does run right when it wants to, and this 
>problem is sporatic!   Any ideas where to start here?  Ive asked around 
>alot, but 
>havnt consulted my Audi tech friend yet...help!