My girlfired has a 2004 Volvo S40 and she tells my that when it rains or when there's heavy fog it's difficult to start the car. We live in a Southern California beach community where theres lots of fog and condensation in the AM, especially during cooler months. It sounds like there is a rumbling noise underneath the car, near the muffler or eshaust system. It hesitates when it starts, then when it does, it sometimes conks out. It sometimes doesn't start for another 5 minutes. I think since the car has a good electrical system that the dampness near plugs and what not may not be the problem. Whats up with the rumbling or gurgling noise underneath? Please help because she's making me nervous about it and who needs that during the holidays?!?!?!!