I live in NC - hot and humid - so this is not a cold weather problem just a problem when the engine itself has been sitting overnight. Van starts fine but feels terrible - like it's running out of gas - until engine warms up to running temp. It's so hot here right now that I like to go out and start the car, get a/c running good, so kids aren't dying in the back when we go somewhere. The past few days, the car has been shutting off when I do this. It starts right back up but cannot stay on unless put in gear and driven. Then, for first few minutes of drive, it's rough and feels like it could sputter out when I hit the gas. Any thoughts? Engine light is not on. 110,000 miles on it. Tune up was done at 104,000. Thank you!