Hi, Ive recently bought this s3 8p and Im having trouble with diagnosing the fault. When driving on the motorway and staying at 70mph for a while the engine management light flashes on for 10 seconds or so then disappears. long story short, Ive had Vasstech take a look at it for me and they've pulled up all the fault codes and suggesting having the evap canister and breather valve replaced which cured it for a short while. Driving it around for another week or so the Enging management light flashes up again and stays on this time and the fault codes that have flagged up on vagcom are the following. P0300 - Random/Multiple misfire P0301- Misfire detected on cylinder 1 P0304- Misfire detected on cylinder 4 P0302- Misfire detected on cylinder 2 P0303- Misfire detected on cylinder 3 (80% of the misfire is logged on this cylinder) can anyone help me or point me in the right direction of why all 4 would be misfiring, the misfire does not cause any sort of loss in power or change the way the car drives. It comes on when the cars been running for a while mainly on the motorway when it sits at a certain speed too long. Cheers.