Hello and good day:
Do you have any CEL (check engine light)???
This is a classic symptom of the VSS:
Vehicle Speed Sensor (VSS)
Originally Posted by Tuneman1984
I just noticed this issue today.
When the car is in neutral, with or without the clutch depressed, it idles normally (little bit of variation but nothing to be concerned about). When I put the car in gear (clutch depressed obviously) it revs up to about 1500 RPM. Any idea what might cause this?
I just had the car into the shop for a charging system check, any chance they goofed something?
The Vehicle Speed Sensor (VSS) is a small signal generator that is turned by a gear inside the transmission assembly. The Vehicle Speed Sensor produces 8 pulse per rotation which a stock computer assumes 8000 pulses per mile. The Vehicle Speed Sensor (VSS) is a variable reluctance sensor that generates a waveform with a frequency that is proportional to vehicle road speed. When the vehicle is moving slowly, the sensor produces a low frequency signal. As the vehicle speed increases, the sensor produces a higher frequency signal The Vehicle Speed Sensor
(VSS) supplies this signal to the components that require vehicle speed information including the speed control amplifier for cruise control equipped vehicles and computer. The computer uses the VSS signal for emissions control programs and speed limiters. The emissions programing can cause a manual transmission vehicle to stall out while decelerating