Black smoke from one tailpipe only...

[ratty65]

Ok so I havent really been driving the dually this summer due to riding my motorcycle unless its raining. I noticed the other day that when i start the truck up ther is some black smoke coming from only one tailpipe be it cold start or even after running a while. This just started happening not too long ago and am unsure if this can be a beginning to something bad or if it is just the carb needing to be tuned properly. At the beginning of summer i pout a new edlebrock carb on it but really didint tinker with it. The truck runs fine but am curious as to what I may be getting into. Oh yeah the truck is a 1987 GMC CC dually with the 454 BBC.