I have an '89 Electra Glide Classic that when its cold first thing it runs good. However it seems that once it gets really warmed up it really starts to spit and sputter like a misfire. I was told that it is possible that the coil or plug wires might be bad. My question is simply how exactly do you test these? I mean I know a multi meter is used but how do you hook it up and what exactly am I looking for in this test?