19671/2 datsun roadster ca18det RUNNING BUT NO THROTTLE UP

[mexican]

i managed to shoe horn a ca18det in to my 67 1/2 datsun roadster the problem i am having is it idles perfect but when you rev it up it pulses from around 2000 rpm to 1800 rpm like a steady beat aprox 75 beats per min .

this is what i have tried so far

tried 3 different maf's
tried 2 different ecu's
tried a different throttle sensor
checked all wiring
checked fuel pessure
checked for vacume leakes
checked turbo piping for leaks

all with no changes to the running of the motor

i managed to get it down to the stock injectors i hooked up my timming light to one of the injectors and realized that for some reason the injectors are cutting out could this be my dropping resistor? i had already tried changing out the ecu with no change