t1m32sh1n3 wrote:
If you give it some gas does that cyl come to life? Out of synch carbs.....if the slide on the carb for that cyl. is significantly lower you could have the same result.

Did you try this?  when you give it throttle, does the dead cylinder come alive?  If so, you are pulling fuel from the main jet.  If at idle, that cylinder is cold, you may have a clogged idle jet, or similar.