nick121320 
2001 pontiac grand prix gtp
Original symptoms:
Regular driving tach goes to zero no cel
Regular driving car stutters no cel
Took excessive amounts to start key on key off cars starts (very rarely did this).
Car rarely throw cel and was gone before i could check.
Parts changed:
Pulled harmonic balancer and replaced.
Pulled off crank position sensor replaced it.
Bolt on end showed wear on 1 thread replaced it with bolt from ace Hardware
Following results:
After replacing of all parts start car everything runs good. Drive it 5 miles that day.
Next day car drive good but after about 20 miles car begins to have stutters as before but occuring in few second intervals as well rpm surge between 500 and 1700 car sounds like its going to stall
What I have done to fix problem:
Pull neg battery terminal restart car.
Results: first time fixed it only for a minute. Next time enought to get me about 5 miles.
3rd time it has not done the stuttering since and put about 20 miles on in 3 different trips.
Could this be a result of needing a case learn or is something else massively wrong?
Case learn is $100 and not trying to throw money at the wrong problem
Car has no cel on
