Question about 1991 Ford Ranger Supercab
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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Posted on Jan 02, 2017
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