So im not real sure what i did to it, but i have a 1995 GMC 1500 that wont seem to rev up past 1500 RPM.It acts like it boggin out, or not getting enough fuel or spark but i know it is. I changed the fuel pump and the fuel filter. That didn't seem to help, so i checked for spark and seem to have plenty. i know im gettin plenty of fuel ( looks like it). Im starting to think i messed up changing out the fuel pump, not sure how. but it is possible i am human.. Any one got any other ideas what might make it run bad and not able to rev up? I might be able to explain more if needed.