I have a 87 22r pickup that runs perfect when cranked up cold but once it warms up it stalls when idling. The carb seems to be overfilling with gas, any ideas on what to do? Thanks

 

When was the last time you adjusted the valve lash? You might have an exhaust valve too tight. Or several. When cold, it's correctly adjusted, but as it warms up, it tightens up. That's why you're supposed to set the valve lash with the engine warmed up. It's a pita, having to remove the valve cover when the engine's hot, but it's gotta be done. Heavy gloves are a huge help. Don't forget to adjust them in the correct order. It's spec'ed out in the FSM.

Alternatively, when was the last time you cleaned and adjusted the carb float valve? If it's staying open too long, your bowl will over-fill.
Also, it may have a small, even microscopic, piece of dirt holding the valve open. When cold, when the choke is causing higher fuel consumption could be using the extra fuel up fast enough that the system seems correct, but when warm, and the fuel consumption is decreased when the choke is off, the piece of dirt holding the valve open is over-filling the carb bowl.

Additionally, is the choke taken off completely, ie the butterfly opens all the way up, once the engine is warmed up completely? You can see it easily by removing the top of the air cleaner while the truck is cold, and warming up.

Finally, the carb float may have gotten less able to cause the float valve to close correctly, thus allowing more than it should into the bowl, causing extra fuel to go down the carb throat.

You can check for things involving the amount of fuel in the bowl by observing the bowl's sight glass during various conditions, to ensure the float, it's valve, etc. are all functioning correctly. IE: Maintaining the correct level of fuel in the bowl. The fuel should always be right about the center of the sight glass, where the pointers are.

Just the few thoughts that crossed my pea brain. I hope something in them helps...
Pat☺