Recently, it has been raining for about to straight days, and the temperature has gotten down to freezing degree. My 97' Boxster would crank but won't igniteand start. I can hear the spark plugs firing into the engine, but still no ignition. I got out my jumper cable, and the boxster would start. I would drive around for the day, and the car would start fine. When I leave the car out for the night under the cold and freezing temp, the car would not start the next day unless I jump start it. Please help. Thanks.