Weird, sudden AFR issue Proform 750cfm!

Aaaaand now the threads are stripped...fml.
Okay. You did or didn't lose the check ball, but you maybe didn't have the gasket back in under the shooter eh?
2, one under shooter, one above under screw head. If its leaking.. one or both are bad and no amount of tightening will stop a leak. Lesson learned. Sucks.