Unfortunately, I still have a few problems with my engine and I hope someone can help me here. To the vehicle: Audi 100 Avant C4, Built:1991, 2,3l AAR with KLR, automatic, 209tkm To the problems: The engine runs in cold condition, in a very “cruppy” condition. The speed is at a level of about 600-700 rpm. When I start the cold engine and pull off the hoses of the KLR, the sound of the engine improves clearly (becomes quieter). The spark plugs are grey/white. I cleaned the cables of the crankshaft housing ventilation and at the same time came much greasy black ?? to the appearance, which was probably oil times. I assume that it looks probably not better in the inside of the engine. The consumption was sometimes very high (estimated 15l to 100km). The transmission switches very rough. When I drive carefully nothing happens at first and then at 1500U/min the car jumps suddenly To the solution: I hope you can help me with this. Please!