FiTech EFI system

Hey everyone. Was finally able to take the Duster out tonight with the new efi and put a goo 80-90 miles on. Immediately I noticed an improvement in general driving, throttle response, and smooth engine operation... Until 4-5k rpm. It is slowly getting better but 5k and up it stumbles something fierce and acts like my old rev limiter as it spits and pops like an fuel or ignition cutoff. I made sure the fuel cutoff was set well above this point to eliminate that as an issue. Anyways, do you guys know of any manual setting I can change to test this issue? Again it's incredibly smooth until a high rpm pull in 2nd or 3rd gear. FYI I used their inline fuel delivery kit.

Any help or recommendations would be great.