"Ninety percent of the time we look for a carburetor problem, and ninety percent of the time it turns out to be ignition trouble." - Smokey Yunick

Plugs and wires are cheap. If you have stock wires check them with an ohm meter - should be around 6k ohms. The SE ones are carbon core too, what you want, and not expensive - just have a silicon jacket. Where I'd start. IMHO.