Sick TSI NEED HELP ASAP

I have a problem with the idle in my 92 talon tsi. after the car warms up the idle does not hold constant. It goes up and down between about 2 and 1.5 rpm. I replaced the tps and the iac and I still have the problem. PLEASE HELP

Have you checked the FIAV (fast idle air valve)?

I have a problem with the idle in my 92 talon tsi. after the car warms up the idle does not hold constant. It goes up and down between about 2 and 1.5 rpm. I replaced the tps and the iac and I still have the problem. PLEASE HELP

Besides replacing parts, what have you checked to find this problem? Try the search bar too that might help you out, also please put your car in your sig just so nobody gives you crap for not doing it and welcome to AF.

Did you do a boost leakdown test? A boost leak could cause poor idle.

Most people have the oppisite problem where the rpm's go up and down until it warms up. Forget what its called but dsmparts.com has a part on their website that fixes that problem. Might be related..I'd so some searchin.