I replaced my oil yesterday with full synthetic oil. I drove it about 10 miles to a baseball game I was going to see, it ran great. Oil pressure was great and drove very well. I then drove home from the game for about 15 miles and went to stop at a light. when I did this my jeep stalled. Now whenever I try to start the jeep it will not idle without dying. The oil pressure is still great, no leaks. It will stay running as long as I keep my foot on the gas pedal, but as soon as I take my foot off it dies. The radio and lights keep working though. Anyone have any idea what this could have been?