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I recommend you hook up a scanner and view the data coming off the tps, map, etc. while driving. I'm thinking the tps may be going out and does not drop properly when you take your foot off the pedal. The pcm may not be engaging the iac until the truck dies and is restarted. You need live data to solve this problem.
check the ground to battery and clean posts if need be, also make sure that the alternator is at proper charging rate. a fully charged battery with engine off should read at least 12.5 or higher. when running the battery should read 14 volts or a little higher. clean corrosion from case also if need be. if the above does not work check engine ground.
The engine has an electronic module where the spark plug wires connect to. Replace this and you will see the difference. Once this module heats up it will malfunction. After cooling down the car will start up again. hope this helps.
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