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My wife and I have a 1967 M20F ( IO-360 A1A). It is in good condition, with only about 160 hours on the engine since overhaul. Whenever she flies to an overnight destination, the next day the plane is extremely difficult to start. Out of the hanger, it starts easily. We have troubleshot many of the common issues - boost pump, P-leads, fuel flow, battery charge, and there doesn't seem to be a problem. Does anyone have any idea what might cause this? Humidity? We keep the plane hangared in North Carolina with a dehumidifier running. Leaving it out overnight on the East Coast subjected to more humidity than normal. Could that be a contributing factor? She has used cold start, hot start, and flooded engine procedures. I know this is minimal information, but I am a deployed servicemember and unable to get my hands on the airplane myself for a more thorough analysis. She is an Air Force pilot with several thousand hours of turbine time, but less experienced troubleshooting 50-year-old reciprocating engines. Appreciate any help or advice. We're both big fans of the forum.