I have a 2001 Volkswagen Jetta with the turbo diesel engine (automatic). Lately my car has had trouble accelerating. When I step on the gas, the engine revs out of control and my rps almost red line before it shifts into second gear. The transition from 2nd to 3rd is a bit smoother. It's not running hot and no other warning lights are on. Can anyone make any suggestions before I start shelling out money I don't have.