I have a 95 Jeep Grand Cherokee Orvis Edition with 125,000 miles on it and whenever it rains or there is moisture present the vehicle will crank just fine but will never start. If I open the hood after the rain and let it air out for a few hours it will start. Obviously this is not very convenient to have to plan my work schedule depending on whether or not it is goin to rain so I would like to fix the problem but I am not much of a car person. Is there anything that I can myself to try and diagnose the problem instead of taking it to a shop??