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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
I recently had an error code indicating misfire on cylinder #4, so I started by changing out all 6 spark plugs. After the change the code is gone and the engine runs smoothly when in park. But as soon as I put it in gear, it vibrates badly. What is the most likely cause?
