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According to anandtech.com, Tom said: "If this only happens at idle and your fans are operating and your coolant level is good, my suspicion is the thermostat. "
YOU COULD BE HAVING ENGINE MISFIRE.DUE TO BAD SPARK PLUGS AND WIRES.ALSO DIRTY FUEL INJECTORS WILL CAUSE ENGINE TO ROUGH IDLE OR IDLE UP AND DOWN.PUT A BOTTLE OF FUEL INJECTOR CLEAN IN A FULL TANK OF GAS.ALSO CHANGE PLUGS AND WIRES.IF TRUCK HAS 30000 TO 60000 MILES ON IT.THATS THE SCHEDULE MAINTENCE INTERVALS IF SPARK PLUGS HAS NOT BEEN CHANGED.
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