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Stalling in 2001 GMC Yukon XL

Well maintained truck has been stalling for the past 2 - 3 months. It will stall when running idle, accelerating, and decelerating. It seems to stall in slower speeds. Battery light and service engine soon light illuminate. It will restart quickly, sometimes after a few tries.

The fuel pump was replaced, and the fuel system cleaned. The CAR WILL NOT STALL for any mechanic. It seems to only stall for me when all six of my kids are loaded in it. Mechanics can not get an error message.