When I first bought my wife an 8v GTI we had a problem with the engine generally running lumpy. I noticed that it wouldn't rev beyond about 5000rpm, sounded like a rev limiter was cutting in. My father being a retired mechanic instantly said "it's the timing". So he put the timing light on it and the mark was slightly out, thus corrected. Unfortunately the car still ran rough.
This is where I get a bit lost, but he managed to time the engine manually with the top dead centre point, or something. It now runs fine, but putting the timing light back on to check, the mark is nowhere to be found!!
Has anyone else experienced this problem? Has my wifes car got the wrong flywheel on it?