Hello, here was already discussed about the clamping gas, here the repair instructions: The cause of the clamping gas train is an abortion on which the throttle valve remains attached, this one has to be removed. I cleaned the throttle valve today and attached two pictures to you. One has to first remove the hose from the air mass meter to the throttle valve, to this one simply screws the hose clamp on. At the back of the suction tube is a artificial nipple, on which is a small the hose that comes from the vent of the valve cover, which is also carefully removed. Now you can see the throttle valve and move with the gas train, open it to 100% and clamp it securely, otherwise there are AUA fingers. At the edge, where the throttle valve is in closed condition, a deposit has formed, at which the flap clamps. This deposit must be removed. The best is to take the throttle valve cleaner from Würth and spray the deposits. with not going off, one can sand away with 800er Schmirgelpapier. To do this, one should cover the intake channel under the throttle flap with a lint-free (!) cloth, which can be watered with the cleaner, so that no Schmirgelparticles can fall into the intake tract. Most of all, the flap clamps at the places near the rotation axis. Then simply screw everything together again and finished. Is a good 1/4 to 1/2 h work. Greeting Tom