Suddenly when the truck is running at normal temp my idle cycles like crazy from normal down to stall when it rebounds.
From what I've read it sounds like a faulty Mass Airflow Sensor but I'll be darned if I can locate one on my intake anywhere. There is a sensor on top of the intake tube between the resonance box and the grill, but I believe that is an inlet air temp sensor.

Any help with the idle cycling or MAFS would be greatly appreciated.

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