7mgte stumble HELP

[ccguy]

-ok so i just checked the tps at the ecu with it running.
-vta at idle is .48 volts
-the stumble starts at .74 volts. (also at 2500 rpm)
-once the stumble starts if i press down on the petal it increases in volts to the ecu up to ~3.7v.
-so i am back to thinking it is a boost/egr/vac leak or something like that.
when the throttle is depressed past the .74 v quickly to say 1.2v it revs up like no problem or stumble.
then when the rpms are still up if i rev it again it will rev like a normal engine. i can hear the bov once i let off of the petal and the throttle body is closed.
i plugged in my spare cps and pulled the fuel pump fuse. turned the ign on and put a spark plug in the end of the #1 plug wire and grounded it to the body. as i turned the spare cps gear the plug would spark the same time the injector would click/fire. so i know my wiring and ecu are seeing the cps signal and telling the injectors to fire and the coil as well.....