Update on the coil replacement: I received the two coils I ordered today. Been over a week since I cut grass and we've had plenty of rain so it is thick and tall. I replaced one coil and set the air gap and put the covers back on. It took a while to crank since I drained all the fuel out of the carb when checking the bowl for crud. About 7pm now and mid 70's outside. I cut the back yard without any trouble. Mower was nice and warm now. Headed into the front yard and cut most of it and then it started. I would notice it when I would still be moving forward and then reverse the mower. Guess I need to replace the other coil. I pulled it into my garage and put the fan on it to cool it down. Took the other coil off and marked it as bad. I put the second new coil on and took off again. I have an extra lot that is approx 100 X 150 and it was pretty thick. I was powering through the grass with no problem. No skips or sputters. It was plowing through it and was still running smooth under heavy loads. I cut that whole lot wide open and on my last pass, yep, started sputtering again. I guess the cool temp had something to do with it running good for a longer period of time. So now I got two new coils and a mower that runs good for a little longer time period. I was pretty confident the coils were the issue. And they may be part of it. Still got something going on though. I'll be running it on the farm this weekend around my catfish ponds. Grass has really gotten tall there. I'll see how long it lasts in the middle of the day.