Its next to impossible to do a plug wire crimp with needle nose pliers.
http://www.ebay.com/ Search 370320134406 I have a couple of pair that look like this. They do both 7mm and 8mm plug wire. As suggested a good scan will help you find the problem. From past experience if your timing chain hasn't been replaced its ready for replacement at this time. Remember if you cut a short piece from the wire you have to skin off about 1/2 inch so the carbon core can be doubled over the wire under the terminal.