Need Help

[Alex818]

Hey guys
i had a evo intake on my 2001 a4 avant and it was running great. but i had to get the car smogged so i put the OEM one back on and now it idles really rough. i checked the sensors and everything looks fine. the car almost stalls if left on. what the hell did i to wrong?

thx

Alex

[Alex818]

and now the check engine light is on...

[Alex818]

bump

i've tried everything. has anyone ran in to this kind of problem?

any response would help

[onemoremile]

Try a throttle body adaptation. Turn the key to the on position without starting the car. Let it sit for a minute or two and then start the car. That may help.

You may have a loose vac line somewhere which could cause a rough stumbly idle.