This engine has about 1000 miles on it, reman unit, no I have not check mechanical timing as it has and does run perfect, then glitches.. did not do this when I first got it.
I'm getting ready to replace the front 2 HVLA on passenger side and the TPS, while its that far ill replace the pressure regulator, clean the throttle body and valves and what ever else is hooked to it, pull and clean and check injectors.
If it still does it ill replace the distributor and start checking wiring.

91 (Gen1) Monty, 3.0L V6, Auto 4 Door.
Disabled Driver.