gregd2 and kenney, before anyone convinces you to replace a coil pack try the grease. one easy way to tell wich cylinder it is, is to wait until dark fire up your truck and look under the hood, you should easily see the spark arc off your block, but better yet just take each wire off at a time and fill it all around the inside of the boot on all of your wires. your coil packs should last you a long time, in most cases over 100k, although I did have one go bad at 75k

 

new wires ,,, i just had mine done after living with a miss off and on for a year .put new wires and plugs ,,, bingo ,,, runs like a scalded dog..
i was about to ship it then someone said put ford wires on it ,,,that was it ,,been a month now and it runs like a raped ape.
hope this helps