Check engine light goes on anf off

What is your question?

After driving for 15/20 miles the C.E.L comes on, if I stop, turn the engine OFF and then restart it, the C.E.L stays OFF for another 20/25 miles, then comes ON again...and I think I smell a "burnt" odor. It is a Chevy 454 (on a Pinncle MH) Thanks a bunch