Track Beast

Hey everybody just joined the corrado forum after long waiting on to get one. Anyways, I have a 94 slc vr6 5 speed manual with 140k on the clock. Sometimes the check engine light will appear then just dissapear after a second. Anyone know about this? Im having trouble trying to find the problem. An advice on how to check it. The oil is good, at its normal level. Never leaks, The coolant is good. But im not sure on why the check engine light randomly comes on.