Season is almost gone and have yet to change anything, to many other things going on and maybe to chicken to change something, maybe. Should at least unflag the code 44

Didn't mention before but my thermostat is 140 (MPI) and motor does not get much above 150 except when running hard. Maybe some of my issue is the motor is running a bit to cool, but was tuned at this temp. Anyone know if it would run cleaner of a 160 thermostat was installed?