Well thanks to this site I got my 1993 s10 4.3 2 wheel drive Blazer up and running pretty good but now I have new problem. When I crank it up and drive it when sit overnite or long time it shifts and runs fine. When I stop and cut it off for little while, it seems to shift way early and bogs down. Seems like it shifts through all the gears at around 30 mph and usually have to pull lever down to drive to keep going. After drive it few minutes all is fine again and it won't do it until I stop and cut it off again. This seems really weird to me so hope someone has some ideas. Thanks.

 

Sounds like something electrical is messing up initially when up to operating temperature...

I would go over your electrical connections at the transmission as well as your grounds to make sure that everything is nice and clean.