Question about 1991 Ford Ranger Supercab

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Intermittent problem. Truck ran fine one day and barely ran the next time I started it. Runs incredibly rough like it's missing but not like a consistently missfiring plug but missfiring on all plugs and won't idle without quiting. When I open up the throttle wide I get power on all cylinders momentarily and then the same thing, coughing spluttering and occasionaly backfiring.... Then for no reason it will run well and idle well and I can drive it normally.

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Check for sticking idle air control valve and stuck open EGR valve. Both are common causes for very rough engine operation due to fuel-air ratio being too far off. Also check for large vacuum leak such as from rubber hoses connecting PCV valve to intake. Feel around for squishy or oily rubber which would indicate a leaking hole in the rubber hoses.

Posted on Sep 28, 2010

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