Audi wont idle after cai install NEED HELP
 

HI, i just installed a cai on my 1999 audi a6 avant and its a 2.8 quattro, before installing the cai the car ran great and had no problems but after installed the cai i crank the car and it started right up no problem but it idled super rough like it had a huge race cam in it then died after a bit. There was no lights on the dash and when i revved it, it was perfectly fine. So i was just wondering if its a vacuum leak somewhere or if i need to reset the ecu.
Thanks!