holy crap what did i do?

[fearnatine13]

Ok, im new to the forums here...i am betting this has been answered somewhere else but i spent about 45 minutes trying to search through the forums to find an answer. i drive a 1969 CST10 with a rebuilt 305 in it (not by my choice) and i am having a problem...i'll be driving and suddenly it will sound like my truck sounds like it misses for a second...then fine...then it happens more frequently until its completely drowning the sound of the exhaust out, almost like the entire passenger side of my exhaust system goes dead. Also when i'm stopped it will idle really really rough...any ideas?