1997 Pontiac Grand Prix. 110000 The RPM gauge is not working correctly. When it is on the car runs, when it off the car stalls even when you are driving it (2009-09-17)
by 
Rich'sgirl
ANSWERS: 2
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It might be a failed VSS or vehicle speed sensor. I don't know the specifics of your car but it is probably mounted on the transmission where the speedometer cable is also attached. You will probably have to take this to a shop for confirmation and replacement.
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Reminds me of a crankshaft position sensor back in the day. That sort of thing should throw a CEL code. If you can't read codes from the dashboard (some combination of turning the key on-off-on-off) Autozone usually reads those codes for free.
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