Problem with gs31 conversion.

Hi guys.

I finished my rebuild on the car and put the l28e I had into it replacing the l20aE.

The porblem im having is,it misses once to operating temp and wont pull past 4500rpm.When its cold,it doesnt miss at all,just when warm.

Im thinking it could be the standard dizzy I had so swap over from the L20e,I also had to keep the ECU and AFM from the L20e unit.

Im going to check the pressure reg and filter later today,and look at converting to the ZX dizzy I have (e12-90?).

Do you guys have any idea what the problem could be?

Anyways,heres a pic of her as it sits.