Never thought fuel filter would/can be the problem.I would have changed it but my parts store was out of stock atthe time. Always figured plugged filter would starve fuel and cause a serious miss/cut out situation.AsI said in my original post she runs great otherwise. Will change filter right away. What about using colder plugs.Iwas told different plugs will increase/decrease temp as well. I understand the difference between coolant temp and internal combustion chamber temp.