I hate to say it, but if you have trips, you might have to do a block-off plate on the 2 outboards & run with center only to narrow it down. Block everything off on vacuum side as described above in addition to that & see if it solves Prob. It's part of the joy of 3 carbs! The base gaskets can leak & cause a Prob.
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"If you do everything you'll win"
-LBJ
13 Smiles per Gallon:
66 Bonneville wagon
66 Bonneville 2d HT - In perpetual progress
2005 GMC L-33
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