Ok, this happened to my friend's Del Sol recently, and he was never able to figure out what the problem was...

I just noticed today, after I turned my car on and was looking for an exhaust leak, that my backup lights were on...while my car was *not* in gear (5-speed). If I flipped through the gears, they'd kinda flicker, but wouldn't actually go out. When it happened to my friend, his would actually go out when he switched gears, but would always come back on. That's about all I know about it. Does anyone have any clue what could be causing this?!

Thanks!