I have a Jetta A 4 2002 and, when driving, it suddenly jerks, EPC and oil indicators turn on and it loses power until it stalls. I try to speed it up but it won't answer properly. Only after 20-30 minutes the engine will start again. The car has been tuned, the battery, oil pump and air sensor changed but it keeps doing the same thing. Can anyone help me? It really worries me when I'm driving and it suddenly stalls.

Whilst driving my 2009 1.9 TDi Jetta suddenly lost power and then died. It starts but dies almost immediately. There is smoke coming from behind the turbo. There is no exhaust gasses coming out of the back at the exhaust. If I disconnect the airflow hose to the intercooler the engine runs.
If i disconnect the air to the intercooler the engine still runs.
Whilst doing either one of the above and i disconnect the air intake from the air filter their is exhaust smoke coming from out ( so it is blowing air instead of sucking.