I have an LX 176 I bought new in 92. Been a good mower. It runs perfect when 1st started until it reaches a certain temp. I've noticed the higher the ambient temp is the worse it is. It has a sputter with a slight amount of smoke. This is what I have done thus far in this order: 1. replaced spark plug 2. removed and cleaned carburetor and installed new fuel filter 3. replaced ignition coil 4. replaced fuel pump. All parts used are genuine JD. Seems to me it would be electric related since it doesn't start until it gets hot enough. I felt confident it was the coil after researching the problem. Long before this problem arose, maybe one of 3-4 times turning the key to crank engine it will do nothing. Turn key back and try again until it turns over. Thought this may be neutral switch located on top of transmission so I bypassed it and it made no difference. Maybe it is the ignition switch ? Anyway, my thinking is this wouldn't be related to my misfire/sputtering issue because once it is running that part of the switch is bypassed. I have some basic mechanic skills but less electronic skills. I do what I can myself on my fixed income. Any ideas where I should go next ? Thanks