I have a Golf 3 2e engine a \ t 1993 model. The problem is that sometimes the rpm be irregular and it is difficult to reach more than 2000 and the car be without power (difficult to move). I checked the car by computer and there is no diagnostic code. And i was cleaned the throttle and stepper motor and the air mass meter, but to no avail, note that this problem is rarely happen to me about once a week and after a long journey in the Traffic jam , drive on the open way does not occur at all , in addition to being at the time of the problem I hear the voice comes from the gate of air mass meter where moving move non-regular>> Please help