i am having the same trouble with mine and mines an ADY tried everything cleaned mas sensor ,throttle body ,new plugs ,dizzy cap, rotar arm, ht leads ,new breathers, air filter, cleaned all earth straps still the same spoke to a local vw sepcelists about ecu and fuel relays and vag com and he recons its the timing and told me he would recomend checking that before going down VAG COM or relay ROUTE so booked in next week so i let you know if it gets solved,