Fast GTO

A buddy of mine with a 427 with AFR heads, MAF, Fast 90/90, stroker, Trex etc... is having some major issues with a crank shaft relearn DTC. I did a relearn for him a few times but he is still having issues. The problem is that when he romps on it, it sounds like his timing is off or he is misfiring (no misfire codes). I clear this DTC and when he is cruising at low mid RPMS he has no issues. When he romps on it again it makes the same 'misfire' sounds, the tach goes out, and gives the crankshaft relearn code. When he is idling he has no issues, and when he romps on it from neutral (idle) the same thing happens (sounds like a misfire and tach goes out) and the engine shuts off. Any thoughts?

We have done a voltage test and the wiring harness and all the connections seem to be good....

Bottom line, I clear the DTC, do the relearn and the car has no issues at anything below 4K RPM. When he goes WOT it sounds like it is misfiring the tach goes out and the DTC comes back.

BTW this is an Fbody.

One of the other guys working on the car made this post for the same issue:
https://ls1tech.com/forums/showthrea...kshaft+relearn