Yukon Dies ONLY when Towing (Tahoe/Suburban/Silverado/Sierra)

Description and fix of intermittent engine dying ONLY when towing. SUV would run perfectly when not towing. Applies to Yukon (XL), Tahoe, Suburban and GM full size pick-up trucks with LS engines.
Required new AC Delco Crankshaft Position Sensor W0133-4075070 (and relearn procedure)