This is a "coil on plug" system and the coils sometimes get weak. Have the computer scanned for codes and misfire data and you can find out which cylinder is causing it. I would change the coil for that cylinder and if over 60K, I would replace all the plugs also.
Feb 13, 2011 at 3:25 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.