This is for the Dobeck guy. Would it be advisable to turn the screws on the potentiometers back to zero a couple of times a year and retune? I am thinking that it might not hurt to retune in the fall when the oil companies reformulate the gas for the winter blend and again in the early summer when they reformulate again for the warm weather blend. My reason for asking is that I have started to get a little popping during the cold weather that was never there before. I am thinking that it could very well be because of the reformulated ethanol in the winter. Am I dreaming here or could there be some wisdom in seasonal retuning?