[Shotimes] CPS Failure Mode Confirmation

[kpdfamily@netzero.net]

After reading of CPS failure for the last 4 years it appears that I now have one of my own.  I just want to confirm that this is the case before I replace it.  Symptom is the vehicle will stall (check engine light comes on), with the vehicle travelling 50 MPH (MTX still in gear) and the engine spinning at 2000+RPM the tach reads zero.  Car will then suddenly come back to life and run normal.  It did stall once on a side street and wouldn't start for 10 minutes.  On this occasion when cranking the tach would read correctly but the engine wouldn't fire.  Opinions?