Check engine light comes on my 94 Corvette intermittingly.

What is your question?

Engine runs smooth, all gauges read normal, no codes show up when hooked up by mechanic.

What makes this problem better or worse?

Take for a drive and after I stop on maybe 3rd stop. turn off and then restart car, the light comes on. Then after I turn car off for a couple hours the light goes off.

How long has your 1994 Chevrolet Corvette had this problem?

few weeks, just bought car.