87 Ford Ranger XLT 2.9 v6At idle engine RPM fluctuates. Why?
Country: United StatesMake: FordModel: RangerYear: 1987Engine: 2.9
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the curb idle is to low from sludge build up on the throttle plates and idle air control motor
buy carb cleaner and get a old toothbrush and clean the throtle body plate sludge
remove the idle air control motor and spray some into the iac valve but quickly remove it and blow it out cause the valve to go bad if left i for to long