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Change the temperature control sensor to the front if the engine near radiator 1 start the truck let it run till you think it is at normal operating temperature 2 unplug the temp sensor if the idle changes then the sensor is bad
The brake and ABS lights could be on because of a brake or ABS problem. The ABS system uses the hydraulic brake system in addition to the ABS components. The high idle could be a vac leak or a problem with the idle air control valve. You could check the computer for trouble codes even if the warning light does not stay on.
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