I have a 1994 Blazer 4.3 cmpi that when it warms up to normal operating temp will stall and won't start up again. When it is cold it fires right up and runs great. When it stalls it doesn't sputter or anything it just stalls when returned to idle. Then it usually won't start again until it cools off a bit. It does still have spark when this happens so I'm thinking some kind of fuel problem. Any help will be greatly appreciated. Oh Yeah, no codes at all from the computer.

 

I have almost the same problem my friend. My 94 4.3 CPI also runs like a champ when its cold and starts to buck and sputter once it gets warm than dies all together.

 

i had a similar problem with a 92 s10 pickup had the 4.3, it was drivin me nuts for the longest time, then it finally quit starting, and shortly after determined that it was the starter, my thermostat was one of them fancy works only when it wants to types and well i used to beat the **** outta that truck everyday, so it was no big surprise when things start to go. i cant really remember what else i did to fix the issues, check battery connections for and corrosion and make sure all connections are good. my best bet would be with the starter though take a look at it, i was able to get a good look from the passenger side wheel well or just crawl underneath

 

take a meter and check your ignition coil.