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That was a little hard to translate, but you may be correct in that the oneway vacuum valve may not be functioning correctly. To test it, push on the brake pedal real hard and then start the car. The pedal should sink about 1 inch or so after the car starts.
After the car is warmed up, push on the brake and watch the idle. Does it change at all? Another indication of a faulty valve.
The oneway valve is a little hard to replace because of the barbs on the valve stem on both ends. The warmer the plastic, the easier it is to remove. Then you can just blow through it to test it before buying a new one.
Klaus
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I still miss my 164
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