Hi, I have a 46" Murray Tractor with a 20hp v-twin........down on power.....checked the plugs and one was hot and one was cold......switched plugs...same side not firing.......pulled plug on that side.....have good spark....started it with that plug out and it appears to have good compression, or at least some.......So, I have spark....have compression......why would it only get fuel to one cylinder ? .any ideas ??? Thanks