Trust me these are going to be cake compared to getting 4 carbs out from the valley of an 84 v4 Magna!
However, since it's been sitting just bite the bullet and get them out. Either the cable is binding up, or the butterflies are sticky from nasty old gas turned to varnish. Either way, it'll never be "right" until it gets cleaned out. As long as you ride it regularly after you shouldn't have to go that far again.
Pull them out, fully disassemble and clean thoroughly. I've used Berryman's Chem-Dip (looks like a gallon paint pail, found at local auto parts store) with great success, even on some super nasty ones (13+ years sitting). Remove any plastic/rubber/non-metal and soak overnight then rinse. Comes out like new.
Since you'll have it apart at that time, it's a good idea to check/lube all the cables. If you dig around in the tech section for the 1400, somebody's got the shop manual posted up.