I have a3 3.2 on a 2004 plate. I have no ECU warning lights etc. I've started to get a missfire when idle you can see the drop in the rev's. its very random as will be fine then a drop an back to normal. the car pulls back an be jerky when driveing at a idle speed an when you increase speed it will go to charge off then hold back then charge off, also noticed when driveing an slow down sometime the revs are at 1100 ish then 4 sec laters will drop back to 700. I taken it to audi an they changed the 6 coils due to recall. The problem was still there. We put the car on the computer an he said could be my timing chain, but then he had a think an said no its not that as the reading was 7 an normal was 8 an -1 was the opp too saying it was warn instead like was tight. After running the car on the computer it was showing problem with number 5 cylinder also minor on 3. not sure what test this was as was done as the car was running at idle. From that he started saying it could be the injector but was not 100% on that. I was wondering what you think.