Help me diagnose my miss over 4500rpm.

No hint of ping and runs smooth and sweet up to 4500 rpm then sputters badly (even free revving it in park). It recovers immediately when I shift. I used to shift at 5300 no problem, and accidentally let her spin up over 6000 once unintentionally.


What spec does everyone use to set the reluctor gap to?


Cley
I believe the factory service manuals list the reluctor gap at .008 set with a non-magnetic feeler gauge. [Brass)

What did you change since the last time it ran up to 6000 rpm's?