hey wats up? i just turboed my 90 gs with 91 tsi turbo parts, ecu, turbo, cooling system stuff, everything... i am having n idle problem where it idles at 2300 wen it warms up... sometimes it does idle slower at like 1500 but idk wat the problem is... i just want to get it fixed so i can sell it

 

trying adjusting the BISS screw. Heres a link too it
http://members.shaw.ca/dsm.1000q/Eng...er/1G/biss.htm

If that doesnt work then you may have a vaccuum leak somewhere. But usually it will fluctuate so im guessing this is the problem. Its important that you first let the car warm up first and let it settle to the 1500. then turn it till the idle goes to around 800