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I noticed above that you said you installed a new TPS. Did you adjust it correctly? With the engine off (and in a quiet area!), put your ear right next to the throttle body. you should hear a faint click as soon as you start to move the throttle off it's rest position. If you don't hear the click, or you have to move the throttle any more than the slightest amount to make it click, your TPS is adjusted wrong, and that could possibly cause idle problems.
Unlike most cars, the TPS in a 944 is a "throttle position SWITCH" it has 3 positions. Idle, full throttle, and everywhere inbetween. If the DME is not recieving the idle signal, it will think your foot is slightly on the gas, and it won't know what to do.
Also, check the large rubber hose in between the air flow meter and the throttle body for leaks. This will cause idle problems as well.
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Mike
'92 968
'01 VW Jetta TDi
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