Jake 85 sr5

I have a 85 pick up with a 22re it's a newer re build with around 60 k on motor and Trans after putting after market 220 cc injectors it started feeling sluggish half way though rpm and when you push clutch in it kinda leaps forward like how it should pull if it was responsive it now will start completely missing at around 4thousand rpm and I don't know why could the fuel pump not be able to handle the bigger cc injectors at high rpm? Or could air to fuel now be off? spark plug color looks good. Any advice would help thanks.