I have a 2000 passat wagen 1.8 liter turbo that has been chipped. I only have had the car 3 months and the turbo selfdestructed (bearings fried to the point where it became a hunk of metal. All the moving parts fused/welded together). I have this problem that I hope someone reading these posts might know what is going on with this car. When I go to accelerate, and then I have to back off because someone cut me off or slowed down, I get a severe jolt when I am accelerating again at around 40 mph. Seems like something is disconnecting then slamming back in behind the driver seat. If I had a rear wheel drive car it would seem like the drive shaft was coming out of the differental then slamming back in. It does not happen at any other speed. My German Master Mechanic who replaced my turbo and oxigen sensor said the car is perfect and tight as a drum. Yet this quirk in acceleration persists. Anyone have any similar experiences or know what causes this? Its driving me nuts. A volkswagen dealership near me told me it was a shift point and all volkswagens do that. I dont quite buy that theory. I would like to hear from you if you by chance know what is going on. Thank you for your time and interest. Elliot