Alright, here it is... 13BREW FD w/ BB single Microtech LT10 and full supporting mods.

Injectors are 850 primaries and 1600 secondaries.

If the setup is put on 4cyl/R it completely bogs down and shutters/pops with so much fuel. Hitting the gas makes it way worse.

If put on 6cyl/R it revs perfect, but drives in 3rd-5th like its towing a boat. It jerks and
stumbles while the fuel dumps out the exhaust. Only the lightest throttle input will increase speed. Highway driving is extremely slow.

My engine builder says this is not normal for it to idle and rev on 6cyl but not 4cyl...

On the road if I hit 0psi and start getting positive pressure thats where I get the stumbling... Are my secondaries coming online or something?

Any more questions to ask and I will explain more... NEED HELP.

I am not a tuner so if something I said is weird, I didnt know.

 

sounds like timing is way off, did he setup the crank triggers correctly?

 

I reckon the computer isnt mapped properly.
Or its wired up wrong.