first test is cranking engine with one wire at a time on a plug held to the side of engine. other one on the ground lug. if you see good spark on both plugs, both coil and everything else should be good 2 go. if no spark, you have not isolated which component is bad, but you know you have a problem. if no spark, unscrew the plug wire end (spark plug end) off the wire. cut it back 1/4 inch or so. crank wire end back into wire, and check again. the plug wires are built into the coil and can't be replaced seperately.