I drove my 1989 Volvo 240 through a water crossing that was much deeper that meets the eye. So my engine came to sudden stop in the middle of a large puddle and would not restart. After having my car towed home, I removed the spark plugs and cranked it to pump the water out of the cylinders. From cylinders #3 and #4 each cylinder must have pump out about a quart of water. All spark plugs were cleaned and WD-40 was sprayed in to each cylinders. I then used my air compressor to blow air into the cylinders to make sure they were nice and dry. After a couple of tries I was then able to get the car to start. I took her for a good 5 mile test drive. She seems to runs fine. Except, when I come to a sudden stop or traffic light it will sometimes stall. But it will always start right up again no problem. It keeps a pretty rock steady idle at about 750-800 rpm all day. I'm thinking that maybe the throttle body or intake gaskets got water soaked and are now creating a vacuum leak whenever I come to a sudden stop. I was gonna give it a day to dry out and see if that helps. If not I have a spare set of gaskets. I haven't checked the oil for water to see if I might have a leaking head gasket but I really don't think that I do. I am pretty certain that I managed to save this engine before the water permanently damaged it. Tomorrow on my day off and when the weather is better I will give my Volvo much more attention. Any ideas, tips, or things to be on the look out for would be greatly appreciated.