El 4.0 no injector pulse on 1 3 and 5.

I havea 4.0 EL. It started playing up at low revs, then wednesday last week i lost pulse on 1 3 and 5 injectors.
There is power but no pulse the other 3 have pulse. I am tracking the wires from the ecu still havent found a problem.
I have changed the dizzy but no luck.
Where should i try now. Is the pulse width modulator in the ecu or is there a seperate module?
Thanks sharn
There is power but no pulse the other 3 have pulse. I am tracking the wires from the ecu still havent found a problem.
I have changed the dizzy but no luck.
Where should i try now. Is the pulse width modulator in the ecu or is there a seperate module?
Thanks sharn