2002 Hyundai Sonata Stalling and Quitting

This happens intermittently, but most frequently just after it rains. The car has recently started to stall and sputter. Two things will happen, either I pump the accelerator and the engine will come back to life or the check engine light goes on at which point I have to restart the engine. When I restart the engine, I seem to have no more problems. This happens at random. It can be while I'm driving on the highway (which is one scary thing when you are on a 5 lane highway and your car just dies), on a city street, just as I first start the car or sometimes just at a stop light.