As I was watching the bird running today and it was idling rough, I noticed a small bubble coming from the intake manifold in the area of the 3rd cylinder on the driver side....directly in line with the carb.  The bolts are the ones with the spacer.  I shut it down and found both of them loose.  I will let the engine cool completely down.  QUESTION   Should I loosen all intake bolts then retighten them in sequence?  I prefer not to remove the manifold.  This rough idle just seemed to appear.  No coolant is evident, anywhere.