Help!!
 

I have a 1988 Mustang G.T 5.0 it will not crank all it will do it turn over i have replaced the fuel pump relay hot wired the fuel pump i finnally got it to crank drove it to my house from my shop and it would not go over 25 mph cut it of and tried to crank it again and im back to square one i beleive the injectors were not all fireing i beleive it may be my computer on the car any suggestions

Have you changed the fuel pump? the filter?

Friend had a 92 that would do the same thing. He finally replaced the fuel pump and it worked ever since then. He also had a few fried power feed wires going to the pump that he replaced as well.