I know, it's not a Camaro, but hey, i need to keep my daily driver running in order to afford to keep my Camaro looking nice!
I have a 1991 Nissan Pathfinder with 111k miles, V6 engine. When the car runs fine, it purrs like a kitten. No smoke out back or anything like that.
Anyway, the problem is an irratic one. Once in a while the rpm's go way down and then shoot way up. Recently was idling so poorly it almost would stall at stop lights. Black smoke was coming out back also.
I pulled the plugs and all 6 of them were completely covering in black soot. Not wet, like oil, but i suppose carbon.
I cleaned the plugs up and the car runs just fine again. I'm pretty stumped, cause everything seems to be in order and running well, and then out of the blue, this happens.
I thought maybe the O2 sensor or idle mixture, but just not sure...
I believe these cars are computer controlled and dont need mixture adjustment.....
thanks in advance,
My '69 Camaro Convertible