Ford/ Mazda 4x4 Auto has developed a skip/ buck at low RPMs while in high gear. on 1999 Ford Ranger

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Have replace plugs wire twice, EGR Valve, intake gasget twice, and fuel sensor.
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(1) Comments
No not at this time... Just had a vacume leak test with smoke and checked plugs, wires again still skips when warmed up but not when cold. It is like a miss or buck in high gear 1500-2000 RPM.