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Try the fan blower. It should be inside the cab, on the passenger's side, under the glove compartment. Easiest way to check, when is not working, hit the plastic cover under the glovebox, if it starts, it is the blower. Sometimes you need the hit it several times, until you hit the actual blower.
There are several problems and they are all related. Check plugs if they a white with gray ash buildup. Gap .054
1. Fuel pressure regulator, if it is ruptured fuel will be vacuumed straight into the the intake causing idle surge also in causes temperature fluctuation and poor performance. It will also cause lean running condition. 2. The Mass Airflow Sensor also has a huge impact on mixture, defective symptom was a knocking and clattering under load especially uphill. Cleaning will only give temporary fix. 3. Spark Plugs- Do not use Platinum plugs they run hotter than standard plugs! 4. Any intermittent starting problems are likely fuel pump related, when you turn the key in the ignition you should hear the pump running!! 5. Preventive maintenance is the key change your fuel filter at recommended intervals.
I have a 94 Explorer, it run very poorly after changing these items it runs great, restored power, idles great and great mileage again and finally no more temperature fluctuation.