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Probable causes of "Engine misses at idle speed": (1)spark plugs worn, fouled or not gapped properly; (2)fault in the fuel or electrical systems; (3)faulty spark plug wires; (4)vacuum leaks at intake or hose connections; (5)uneven or low cylinder compressiosn. - Haynes Repair Manual #36071; 1993-2005 Ford Ranger Pickups Pull the plugs, check for oil. If there is oil on the plugs, your piston rings are bad. Replacing them is an expensive process.

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Q: Low acceleration miss or sputter on 1999 Ford Ranger 3.0?
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