its a NA s5.My idle is weird. Out of know where the rpm's started pulseing (1500k-2500k). Car starts up everytime but, after its warmed up it starts to do it again and sometimes even the warm up goes out of wack(revs up to 5k ).When I turn on the AC , the rpm's drop but it drops really low makeing the car stutter a little bit. Is this a TPS or BAC problem or is it something worse? Also, would this cause my check engine light to be on? Any Info would be greatly appreciated.

 

get the compression checked.

 

bac check, pull them codes

 

TPS more than likely, either it failed or is out of adjustment causing the CEL to be on.

 

call Adee-do

 

yup.

 

# please.