Woooo hoo. I'm so happy my car is misfiring again. Not. Any ideas anyone? Started weeks ago when it was randomly misfiring on one cyl only (didn't know which one), and only when on full boost. No Fault codes. Changed spark plugs. All good. . Two days later, misfire is back . One cyl again (Still no idea which one). Took coils out, had a look, all OK, put coils back, tested, all good . A day later, misfire back. . Decided one coil must be dodgy so bought a pair since 2 of them are obviously newer than the others. Collected and fitted them (not genuine). Tested. All good . (See a pattern emerging here) Three days later, misfire back - but worse this time and doing it on idle. . Swapped coils about and eventually found it to be one of the new coils. A pain, but not the end of the world. Phoned and ordered replacment. . Replaced with old Audi coil as temp measure. A couple of hours later, misfire back! . Swapped Audi coil and second new coil around. Now OK. Found a break in the main power wire sheath to Cylinder 3. Stripped back and insulated. At this point it all seems to be centering around cylinder 3. Left second new coil in cylinder 3. Cylinder 3 kills this coil as well. Order second replacement from a p*ssed off motors factors! Collected them Wednesday and fitted. Driving fine. Thought it might be sorted this time. Good as gold yesterday. Coming back from work today, misfire back. Deep joy. . After shouting and screaming at the car I give up. It MUST be something else. But what? Help. Before I kill it. If I change out the coil in cyl 3, I'm sure it will be fine for a while an then start all over again... Bad earth maybe? Faulty injector?