Engine stalls when warm

Is the Check Engine Light indicating and have you tried to retrieve for trouble codes? Was anything done prior to this occurring?

Try checking for trouble codes. The overheating could have caused some sensors to malfunction, maybe working but slightly out of range. The Engine Coolant Temperature sensor is one thing you should check as problem seems to be tempearature related.
Do you have any coolant losses or overheating issues after water pump replacement?

Plugging in a scan tool to monitor the various sensors would be the best way to go about if no trouble codes are present. The throttle position sensor and MAF are 2 other items that can cause the symptoms described.

You're welcome. Keep me posted of the outcome.
Have a nice day.

You really should start a new question, and be sure to list the exact engine size, transmission type, and mileage. We use that information to tailor our answers. This is an old conversation between two people, and shows up on our list as already having received a reply. As a result, most of us won't read your addition or have a chance to reply. That won't get you the help you want.

There's no sensors to clean, and cleaning won't solve a stalling problem. What is the rest of the story? What does it take to get the engine restarted? Do you have to wait for an hour or will it restart right away? When the problem occurs, will the engine start if you hold the accelerator pedal down 1/4"?

Have you read and recorded the diagnostic fault codes? Do you know how to do that yourself? Has the battery recently been disconnected or run dead?