HI CAN ANYBODY HELP!!?? I SEEM TO HAVE A MISSFIRE, WHEN REVING THE CAR AS THE RPM REACHES 4,000 RPM THER SEEMS TO BE A MISSFIRE ON ONE OF THE CYLINDERS FOR APX 1,000 RPM, I HAVE HAD THE CAR PLUGED INTO VAG COMPUTER BUT IT DID NOT SHOW ANY FAULT CODES?? ANY ADVICE WOULD BE GREAT!