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Stalling when warm....

Have you tried cleaning the MAF sensor? Often a problem of warm/hot stalling.

Here is a paragraph from rrremedies;

Mass Air Flow (MAF) sensor has caused stalling upon startup, refusal to idle when hot and excessive fuel consumption on both his RR Classic and his 97 Discovery. He first discovered it on his Disco when it generated an OBD-II fault code indicating "exceeding max air percentage". Cleaning the sensor solved the problem. On his Classic, he zeroed in on the MAF sensor incorrect air mixture message after his attempts to fix the stalling problem by changing idle air control valve did not work. During his investigations he accidentally disconnected the MAF sensor, and found that it made little difference -- leading him to suspect it might be inoperative. After removing the snap ring and screen, he gave its insides a good lean by injecting the following into the sensor hole: WD-40, diluted simple green, water, and low pressure air (the latter two to flush out any residual lubricant). If he was doing it again he would use tuner cleaner (the TV stuff available at Radio Shack), but would still recommend flushing out the lubricant/cleaner.

worth a try,
Good luck,
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