Question about 1999 Pontiac Grand Prix

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1999 pontiac grand prix

My daughter's gp will cut off at various times; sometimes it will start right back up, sometimes not. I have replaced the ignition module and all three coils--- which seemed to solve the problem for about three days but now she has the same problem. I plan to replace the crankshaft sensor this weekend. Local mechanics have tried to fix the problem with no luck since no failure codes come up on their analyzers. If you could help, I would very much appreciate it!
Kevin Stout
blueskyzcom@starband.net My son's '99 GP has been having the same problem off and on since last year and have had it in the shop 3 times, first 2 times at a local automotive repair last week with a Pontiac dealer. Randomly stalls after 20-40 minutes and sometimes starts within 5 mins and other times after waiting 30-60 minutes. All the mechanics find no error codes. Last week we finally broke down and had them replace the fuel pump and module - $800 job! Next evening after getting car back, car stalled again and would not start after 30 minutes of trying. Pushed to parking lot and left it overnight - next morning started right up as though nothing was wrong. Had AAA tow car back to dealer who still has car and says they cannot find anything wrong - still not throwing any codes and runs fine in their shop.
Need advise - What's next?? The crankshaft position sensor?? Cannot believe these "trained ASE mechanics" cannot commit to what the problem is with all the same issues I see on the Internet.

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Ignition Switch

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Catlytic converter sounds just like the problem i had

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