Ok Guys, my Cousin has an Audi A4 1.8T and her engine is misfiring. I pulled the codes and looked them up and it said the engine was misfiring on cylinders 2,3,4. Anybody know anything about these cars. I pulled one of the plugs looked fine. I took off all the cop cleaned them put dialectical gel on all of them and put them back on. I cleared the codes took it for a test drive and now only cylinder #1 is misfiring. does anyone have any suggestions to what i should look for. From what I have seen people are saying the COP go out. any suggestions would be great.