Engine Mechanical problem
1997 Pontiac Trans Am V8 Two Wheel Drive Automatic 71000 miles

My 97 Pontiac Trans Am starts easily but sometimes immediately quits and won't restart for about 2 minutes

Problem is intermittent. During the couple of minutes when it won't restart it doesn't even fire. After a couple of minutes it will start and run fine. No codes show up after it restarts. Mechanic kept car for several days but it wouldn't do it for him. Engine is a 5.7L V8