7mgte stumble HELP

[ccguy]

with a stethoscope on the injectors i can hear them firing at a nice even pace at idle and with slight increasing throttle they increase the ticking accordingly. just as it begins to stumble the ticking slows WAY down and becomes slower than when the motor is at idle when the stumble starts and continues.
if i rev it above the stumble they are ticking super fast (as they should be at high rpm)
so i am going to look back into reasons why the ecu reduces injector duration....like the main sending units-- afm/air temp, knocks, ect, cps,_____????
i think now i should be looking more at reasons for the ecu to cut injector duration vs the ign timing