Hey Jami, It sounds like the engine needs to be running at a higher rpm if it only runs in low range.
maybe a fuel pump problem?
I'm not familiar with those F.I. systems does it have an electric fuel pump? is it putting out enough pressure? They usually require a certain amount of pressure to work properly. or do you have a stock pump that may be bad? maybe holley has a tech support line you can call.
I am curios about that fuel injection though, how do you like it? have you had a chance to use it or did you just install the system? good luck!
I think i have read that it is sopposed to be used with the stock manifold.
1982 cj7. Frame off. shell valley kevlar body, stainless hinges, Bestop seats and supertop, KC titanium lights, Homemade swing out tire carrier with spare front wheel bearings/hub, Built 304,DUI,Edelbrock shorty headers with dual stainless 21/2 tubes into incynerator cans 21/4 dumped out the back,Edelbrock 600cfm, performer intake and cam, Borgeson lower column, Centerforce clutch, NV-4500, Dana 300 w/custom built twin stick, Homade 1/4" steel skid plate, 2.5 soft ride w/ 1" shackle lift, 33x12.5 mtr's. Stainless fuel and brake lines, Braided hoses. more...