I recently started working on an old merc and it isn't giving me any spark. Now I was able to get a plug to spark once but it hasn't sparked since, at least I think that may indicate the points, coils, and condensers are working. I have noticed the throttle knob is messed up, the knob will turn but the gears and arms don't turn consistently meaning if it's in the idle position it's probably not idle, I don't know what it is. So I'm turning to you guys for ideas on what to do about this. thanks - cj