Hello all, with my old Golf 3 the cleaning of the throttle valve helped extremely much. Especially in the load operation with switched on climate. For this I had removed the throttle valve and cleaned of the resinous oil residue, which have been fixed by the engine block ventilation and suction over the years. In the idle is after all only a minimal gap between the flap and the channel… this gets too, tries the control unit over time always to regulate. If one cleans it, must ma n to reset these values by a certain procedure..be in the Gulf it went like this: quote / copy from the following link:http://www.motor-talk.de/…/…rosselklappe-reinigen-t427792.html?…” for about 5-10 minutes the battery is disconnected so that the control unit loses the learning values. the control unit is now forced to re-learn the values completely. after the battery is connected the ignition must be switched on for about 5 minutes without running the motor. you can now also hear how the throttle valve adjusts. after the five minutes you have to run the motor again for 5 minutes….very important… WITHOUT GAS!!!! then let the car run for 5 minutes in the stand gas. after about 50 kilometers the learning process should then be completed.” What is the procedure for the MX-5?