take the wires off. take the plugs out. look at the connection at the very top of the plug. i had a problem like that on one of my motorcycles before. all it was was that the little piece of metal that screws ontop of the plug had come unscrewed. screw that bitch down tight if it's loose, put it gently into a vice and sort of crimp it. once its on there firmly, put it back on. since the car is OBD II, DO NOT REMOVE THE PLUG WIRES WHILE THE ENGINE IS RUNNING!!!!!!!!!! you can send a charge back to the computer that way and fry it. when the car goes in gear, there's a load on the engine. makes it harder for it to run. so naturally, if there's a dead cylinder, the engine will have a harder time turning over.