I think My Audi is tuned for stage two big t4 turbo, recently purchased car with heavy modifications. I have very rough idle and stalls frequently. When I am on the throttle (higher rpm) and then come to stop sight or lights (low rpm) will idle rough and sometimes stall. I don't have any check engine lights and it usually runs better when started in morning cooler temperature. Warms up and starts acting up. Please help. Also a little ticking not much tho what should I check for? Oil needs to be done it's got color but not that bad..please help I will update progress.

 

Also the radio was on SAFE MODE I actually found my Audi owners manual with the card and code still in it.. Figured that out but just curious if a new battery would affect this issue???