Plugs would probably not be my first check, though fouled plugs or more likely points may be contributing. I would first check fuel and air screens and filters. Be sure you have clean fuel coming through. Here is an excellent resource if you haven't found it already ....
Mission Statement
It depends what format that it's in. If it's in a pdf format, adobe acrobat reader will do it for you and the program is free. If it's in another, let me know and I will direct you.
