fuel issue on rear bank

[marek4792]

I'm having an issue where my truck would surge intermittently at idle when warmed up and I recently start hearing it going down the road. I replaced the rear 3 injectors and metering actuator with no change. what I find very odd is when I go to the cylinder cut out test as soon as I press "start" to begin the cut out test the engine starts shaking like an actuator got unplugged or something. The front bank injectors cut out normally but when I cut out the rear injectors very little change and cutting #5 smooths out the engine for a few moments. This happened before and after buying injectors and actuator. I have checked my overhead but not the injector pre-load for the lack of a dial wrench which is my next step tomorrow. Any ideas what would cause it to act like this besides injector pre-load being too tight/loose??