sitting

My 95 T100 has been sitting up due to a previously discussed transmission issue. I finally brought it home from the mechanic's shop yard (maybe will fix it myself now), but when I started it up this time, it is mis-firing. It began right away, like a stuck valve. After running rough long...

I'm in the process of selling my T-100. After i do that i'm gonna use the money to buy a lifted '89 p/u. The truck hasnt been run for 3 years and needs a new fuel pump. Since the truck has been sitting so long, what things do i need to replace? I'm assuming the battery and oil+filter? What else...