Hey I have an 1986 camaro and I just had my check engine light come on for a few seconds and then shut off for a few n then come back on n immediatly go off....i was wondering if this might be a similar problem that your having? I just recently put a flowmaster catback on my car so that got me thinkin or mayb from my cat. shield rattling but thats been happening for a few months and the light has never come on till now....let me know wat you think thx bye!