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When I start up the car is fine and runs smooth, then after 10 minutes or so of driving when i go to put the car in neutral i.e. as i roll to a stop sign the car will start idle ing really rough and the rpms will drop super low. Then i can give it gas to idle smooth about a grand and then keep the car alive but then the next time i stop after the rough idle it will die everytime when i throw the car in neutral. When i start it up it runs fine again for about 5 minutes and then after a few stops it will idle rough and repeat the process. ANy thoughts? The car is 94 tt BPU
 

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the car is probably running to rich at idle below 1000 rpm. I had a vacuum leak that caused this. check all hoses. also check to make sure that your idle up valve is working properly.
 

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blackbird said:
the car is probably running to rich at idle below 1000 rpm. I had a vacuum leak that caused this. check all hoses. also check to make sure that your idle up valve is working properly.
Idle Up Valve? You mean the Idle Air Control Valve or some other thing?
 
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