1995 Ford F-150 Runs ruff no power

I got a 95 f-150 v8 efi new plugs, wires, distributor, battery, and starter. I starts fine but runs ruff like there is not enough power to make the truck go. Once I get past 10-15 mph it goes away till I slow back below 15. Any ideas?I was thinking egr valve, or maybe a air sensor idk dont want to waste anymore money