Originally Posted by 02blacksvt
No the ca wouldn't actually speed up when this occurred, although it would seem like it was in neutral and would just rev the motor. I work at a shop and I talked to a few of the guys and they said it could possibly be the clutch going out, and it is just free spinning when the problem happens which could potentially make the Rpms and speedo jump like that correct? I don't know how right they are?
Slipping clutch will not fool the speedo.
The speed sensor is in the transmission, the clutch is before the transmission, if the clutch is slipping than the transmission will not "speed up" with the motor RPMS, because it is no longer coupled tightly to the motor.
Slipping clutch is the same as pushing the clutch pedal down.