91 starting issue

I have a real hard time starting, it just cranks after a while
it starts. I have already changed the fuel pump. its a v6 4x4
any help would be great..

I bet your ignition coil probably is going bad. I had the same exact problem for about two months. It finally quit starting at all. I checked it out, and the heat from the motors on them crack the ignition coils every few years. Normal price on them is about 50 to 80 dollars. Check it out, and see if that may be it. Give me a message back if that is not the problem.