I took my 95 caprice wagon out today and for the first time since I bought it got stuck in a long traffic jam to and from where I was going. After about 10 min of stop and go the check engine comes on. I get where I was going and when I come back the light it is off. It comes on again on my way home in traffic. I get home shut the car off and find my scanner and its off when I restart the car. Anyways, it shows in the history EGR failure, or something to that wording. Is this anything to worry about or can I just ignore it? The car runs perfectly.