92 chevy s10 blazer, 4.3 liter, automatic. Engine runs fine before it reaches operating temperature. When it reaches operating temperature it will stall under quick acceleration, but I can accelerate it slowly and it won't stall. I changed the plugs, wires, cap, rotor, and the coolant sensor and sender. The truck won't set any codes.

Have you tried a fuel filter yet? It sounds like the moter is starving for fuel. Also check fuel pressure.

Paul
'93 S-Blazer 4.3 "W"

I changed fuel filter, fuel is fine. leaning more towards the timing.

I'm not really sure that timing is your problem from the symptoms you described, but what the hey, give it a try. Make sure you put it in base timing mode before you check the timing.

The timing may be off

Check that and your air filter (not that it will make it stall, a dirty filter just doesn't help)

What kind of air intake do you have?
On the older intake (snorkle with round air filter on top of engine intake) there is a temperature controlled flap. It is designed to suck in hot air off the exhaust manifold (hose coming off exhuast manifold and running into intake from the bottom) until it warms up. Then the flap will close and allow more fresh outside air into the intake and less exhaust manifold air. About the only way to check that is to look down the snorkle and watch the flap. Do this in the morning when its the coolest out. Is the flap stuck open, does it move as teh engine warms up?

I also doubt its your timing, unless you have messed with the distriburator at all. Well other then changing cap and rotor. The PCM pretty much controls minor timing adjustments so you don't have too.

When is the last time you serviced the EGR valve?