I have a 2002 VW jetta 1.8T, after the car sits overnight or long period of time and engine cold, it takes 10 minutes of idle to warm the engine before driving to avoid some jerking. if the engine is warm or hot, there is no issues with the car. I suspect that the turbo requires some heating up before driving. Does the turbo need to warmed up when the engine is cold? is the turbo running in idle? This issue seems to be a heat related issue with the engine. There seems to be lag between the time you accelerate and the turbo, feels like the car is in neutral for a split second. Does the ECM need to re-calibrated? There are no codes.