I bought a 97 ford taurus 3.0l single overhead cam. Test drove it an it was fine. Picked it up the next day which was raining an the engine through a misfire for cylinder 2, the problem was the wires were fallin apart, replaced the wires. Now when i drive it for about 30 mins or so an go to park it sets off cylinder 1 2 an 3 misfire, wires are good triple checked em plugs are new. It has a lil stumble while idling, put it in gear an it bogs down but doesnt stahl. no hesitation on acceleration. The previous owner put a head gasket on it. head bolts were not changed. If anybody has a idea please throw me a comment.