Every now and then the car has these sort of "hiccups", where I feel the fuel isn't getting to the motor sufficiently and the car begins to have spurts of speed and then will cut off and then on again. At the beginning, the motor would just shut off and as soon as I would turn it back on it would be fine, but now its getting out of control; I'll be driving and all of a sudden it will feel like some one pinched the fuel line and I will instantly loose 10 MPH and then it will go back and forth. I notice this happens usually when I have the AC on (set to a low or 1). I have taken it to 2 different VW dealerships and they have both said the same thing, and have found nothing wrong with the car. I am going crazy because no one can tell me what the hell it is or what the F$#% I should do. I hope someone could help me in this matter, PLEASE.
P.S. Nothing has been done to the car, and has all of its stock parts