Strange idle problem
I've got a strange idle problem I'm trying to diagnose. I've got an '01 GT-S 6spd with 47k mileage. Basically, the car idles perfectly when the car is stopped. Right at 800 +-50 rpms. When I get the car going 40+mph, and depress and hold the clutch in or put the car in neutral, the rpms will drop to normal idle speed, and then it will fluctuate between 800 rpms and 0 rpms intermittently, until the car comes to a complete stop, and then it will idle perfect. I noticed the problem about a month ago driving down a hill and I got lazy and put it in neutral.
The car has stalled like this about 3 times, so it's not just a guage issue. I went to the dealer and talked with a tech, and he hooked up an OBD-II sensor, and the ECU didn't throw a code. I then took him for a ride and showed him the problem, and he was stumped. An insight?
My thought are:
1. Speed Sensor?
2. Throttle Position Sensor?
The only problem with the TPS is that it shouldn't idle correctly while motionless.
2001 Tribal Flame GT-S STS Monster
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