HELP ..Runs dies No start .. then start

So if I got you correct...

Old ECU, old pickup - engine runs but dies after 40 minutes
Old ECU, New pickup - engine runs but dies after 40 minutes
New ECU #1, New pickup - engine will not start
New ECU #2, New pickup - engine will not start
New ECU #3 , Old pickup - engine starts.


That is the strangest thing I have every seen.

Did you properly gap the pickup to reluctor when you put the New pickup on the first time?