HELP! 93 explorer fuel problems

i have a 94' explorer 4wd 181,000 miles on it. the transmission went so i have one from a 91 ford explorer 4wd in it now with only 131,000 miles on it. "it cost me less to buy another car than to buy a new transmission" anyway my car has lost its low end acceleration power. i step on the gas and don't take off like i used to. i just replaced the fuel pump, i had a broken valve on the top of the pump. "the smaller of the two that comes out of it." i thought that would fix the problem. the fuel filter was also replaced but now i have fuel pressure "i assume" since the car moves when it hit the gas but i don't have the power i used to. the truck would push you back into the seat when you hit the gas now its not as aggresive. what happened to it and how can i fix it?

also i did clean the MAF with sensor safe carb cleaner. it had some dirt on it but nothing serious. replaced my battery terminal and still the same problem