So let me tell you folks what happened me tonight! I pulled out to pass a car, and planted the s3 in 4th gear. Everything was fine initially, as I was just about to pass the car, the power dropped suddenly, and the orange emission control system light started blinking on my dash. This had never happened before, and with the sudden loss of power I thought something had gone seriously tits up! I safely returned to my own side of the road after passing the car, but eased off the throttle considerably. As the light was orange, I knew that it was important but It didnt require me to actually stop (like a red light would). So I drove gently, and after about 20 seconds the light went away. When I got to my destination I checked the drivers manual, where I found out the light was the emission control system light. There wasnt really anything more I could do until I got home. So on my drive back home, I started off gently, and then built up my speed. When turning off a junction I gave it a bit more juice, and also held it at 60, coming up quite a steep hill, but no sign of the light again thankfully. I plugged it into VCDS as soon as I got home, and it told me that I had a misfire on cylinder one. Here is the piece of code: Code: Address 01: Engine (CDL) Labels: 06F-907-115-CDL.clb Part No SW: 8P0 907 115 AB HW: 8P0 907 115 B Component: 2.0l R4/4V TFSI 0010 Revision: 5BH16--- Serial number: Coding: 0103000C180F0160 Shop #: WSC 12345 616 12345 VCID: 2 Faults Found: 000768 - Random/Multiple Cylinder Misfire Detected P0300 - 001 - - Intermittent Freeze Frame: Fault Status: 00100001 Fault Priority: 2 Fault Frequency: 1 Reset counter: 255 Mileage: 59474 km Time Indication: 0 Date: 2014.04.19 Time: 20:04:49 Freeze Frame: RPM: 4346 /min Load: 89.4 % Speed: Temperature: 87.0Â°C Temperature: 13.0Â°C Absolute Pres.: 1010.0 mbar Voltage: 14.351 V 000769 - Cylinder 1 P0301 - 001 - Misfire Detected - Intermittent Freeze Frame: Fault Status: 00100001 Fault Priority: 2 Fault Frequency: 1 Reset counter: 255 Mileage: 59474 km Time Indication: 0 Date: 2014.04.19 Time: 20:04:49 Freeze Frame: RPM: 4346 /min Load: 89.4 % Speed: Temperature: 87.0Â°C Temperature: 13.0Â°C Absolute Pres.: 1010.0 mbar Voltage: 14.351 V Readiness: 0000 0000 Im thinking it could possibly be: - Plugs (I upgraded the OEM plugs to the ones in my sig) - Coil Packs (I heard there was a recall on these for my car?) - Fueling. I am running Revo Stage 1, and have heard of other s3 owners running Stage 1 and having to upgrade their fuel pump. Maybe my car isnt getting enough fuel at that point, causing the misfire? Im running the Revo CAI as well if that is any bearing on it. Thanks in advance to everyone for posting up any thoughts or advice. Cheers.