Low idle in park, then dies in gear

[95TSiNewbie]

I just had a 3" cat back installed on my car last week. Car was running great until the great Chicago 100% humidity and 90deg weather kicked in. So I turned on my AC for the first time ever since i've owned my car. Drove the car to work, then lunch, and on the way back from lunch the car stalled in the parking lot. I restarted it and turned the A/C off. The Rpms read about 300rmps. Let sit for 4 hours and when i drove it home, if i stopped at a light the rpms would drop to like 100 rpms and sputter but not die. Any ideas before I take it to the local Chryslet Dealer to look at it for $100 then charge me $88 an hour to fix plus over priced parts??? Any input would be great.
Thanks,
Bryan Tracy
Oh and its a 95 Tsi FWD A/T with about 94,000 on it. Intake, New Wires and NGK +1 Colder Plugs, Catback and i/c piping.

 

[doodie]

symptoms sounds like your MAS plug fell off but I highly doubt it. Check out that BISS also. Its either the above or you've blown off an intercooler pipe.

 

[95TSiNewbie]

I adjusted the BISS to about 800rpm idle and drove it around. Went a block and died when i stopped. I ordered a ISC w/ motor for $40 so if its not that i dont have much of problem spending $40. Ill check all the I/C pipes again but they were all tight last night, but maybe i missed something.
Thanks
Bryan

 

[jotho]

Did you get the prob fixed?

 

[mitsutuner]

Sounds like your fuel filter is mostly clogged. On a hot day, if there is some sludge accumulated in the filter, it will melt a little bit, then harden into a semi-solid plug when cooled & block your gas flow.
BTW, tell the rest of us where you found the $40 ISC motor & if it turns out that you have an extra one that you don't need, let me know first.