92 Expo Starting Problems - Help

I have a 92 EXPO. Great car. Recently it has had intermittent starting problems. Most of the time it starts right up. But sometimes it will crand but do nothing. Then crank and sputter a bit. Crank and sputter a bit more. The start up. It is like it is starved for gas. Once it is running it is perfect. No problems at all. Any help appreciated. The dealer said that the computer codes were "inconclusive". Thanks, Gary.