Ace

My 200 S4 has an infrequent miss at idle, OE ECU or Chipped ECU. Only at idle. Changed type of gas, no difference. Any ideas? Car has 22k miles and isn't beat on too much. Had this problem since took delivery. Dealer has no clue. Plugs maybe?

93S4Q

I had a rough idle and also some studder at lower rpm with WOT. I first changed the air filter and didn't clear up. so i changed the plugs to iridium plugs this helped but still didn't solve problem. Emailed Denso with some gap issue and they told me to regap the plugs to the audi gap and not the gap they send them out with. this helped much. I finally found out i had a bad TPS (throttle positon sencor) and had this replaced and still was a little rough on idle, so i had the fule injectors pulled and cleaned Professionally. now my car idles with no hessitation. hope this might help.