FiTech EFI system

Tech question,

I have it up and running - finished all the wire tidying up, and wired up the electric fan control.

I'm running a locked MSD Dizzy, timing control through the FiTech (20 degree's of advance at idle) and the FCC for fuel (solid fuel pressure from the mechanical pump and the FCC). It starts and runs fine, idles at around 900 with about 14psi of vacuum and good volts.

Now, if I stab the throttle is stumbles very badly and will almost stall. If I gently throttle it past about 1200 rpm it will rev freely without issues. I haven't actually taken it outta the garage to drive it yet. Is this something that the ecu learning will correct? Or should I be adjusting something?

I'm pretty much a noob at all of the EFI parameters so be basic in your advice :)

Thanks