Hey everyone... newbie here!
so I recently just got a 1990 K5 Blazer with a tbi 350 and 700r4.. on the way home from picking it up it started to get a low choppy idle and would die if I stopped or took a hard turn.
I've been driving it since for about a week and its started up just fine but once its warmed up it will stall in drive or reverse. I'm stumped. what is it? I've read plenty of other posts and I want to get more opinions.
I've replaced the IAC and coolant temp sensor with no difference except it wouldn't start right away without pumping the gas so I replaced the fuel pump relay on the firewall and its fine now.
I also bought a new fuel filter and have yet to put it on.. but I read of the TCC having issues and torque convertor locking up right away causing it to stall, vacuum leaks and I've gone through with a propane torch(unlit) and checked=nothing, cleaned inside the distributer cap and all the wires are good.
whats going on?? thanks !!

 

check to see if the egr valve is getting stuck open. had this happen to a friends truck. would only do it in drive not in park. so i just lightly drove it into a tree and checked it. it was opening wide open for whatever reason. just disconnected it and it ran fine

 

How do I do that?? Is that the diaphragm looking thing on the passenger side?