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Check wiring harnes to fan, using multi meter you should get 12V ot the fan connector with out the air con running and at operating temp, if ac is turned on does the fan run? if so then you need to replace the fan unit .. Easy job about 1.5 hours do it your self . Bear in mind that I am an aircraft mechanic. question let me know I will do my best to help you. email@example.com
It sounds almost like 'vapor lock' caused by a fuel line too close to heat which can cause a bubble in the line and engines really don't run well on bubbles.
On a fairly modern truck I can't imagine that the static ignition timing is too far advanced but I would be checking that too.
When warm, many vehicles will keep the electric cooling fan running for several minutes to prevent vapor from forming in the lines since the external temperature can climb a good bit right after the engine is turned off.