Hello mate, I have had the same problem, does your car rev +5000 RPM once started? It may be your timing belt or something along them lines.. I had the same problem with mine and my MK3 Gti only has 88k on it,
My abs light also comes on when i leave my engine running, i was told its due to the brakes being cold? I dont know how true that is though..
Hopefully someone can offer some better advice!
Peace x