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1997 Ranger, Pinging at Highway Speed
1997 Ranger, 2.3L 4cyl, pings when running at constant highway speed, 55-80 mph. Does not ping when accelerating, or at higher speed (85 or greater) possibly becuase it takes a more open throttle to maintain high speed. Sometimes there is also a slight throttle hessitation, but nothing troublesome. Otherwise runs well. Any ideas?
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