Sometimes when i start my 93 vandura the transmission wont shift unless i maually shift it and the windows wont work and sometimesit runs great

No common problem I am aware of. Normal troubleshooting would be required to find out what's going on. Could be as basic as a common ground not being consistently secure in a wiring harness. Could be moisture in a fuse box. Could be a general module issue, or something wrong with sensors. Would seem to me that one thing is causing all those things if they happen at the same time. Hands on diagnostic testing is required.