Do these cam sprockets still have buttons like the older GM engines? What type of reluctor does it use for the hall effect sensor?

Well, my idea is either a bad CMP or whatever the reluctor is has come apart. I'm not really too familiar with this specific GM engine to have a silver bullet for you though; I'd wind up scoping crank & cam to see what's up.

Rhett Yurgin
Technician
Yeargan's Automotive
Carrboro, North Carolina, USA