I just went through something similar on my340 U. it was driving me crazy! I had the carb on, off and apart so many times i can do it now blindfolded!!!
Through all the screwing around I discovered a leaking head gasket, so I decided to pull the whole thing down and fix it right. During disassembly, I was pulling the manifold off and discovered that ALL of the bolts were loose.. i barely nudged the ratchet to get them to turn. Even though I used either looking for a vacuum leak (to no avail) The gasket was shot and leaking...
Check your manifold fasteners.. Not saying that it's the problem, but I'm sure it was a big part of what was wrong on my tractor... And you can do it in minutes.
Good luck!
This post was edited by werksguy at 20:10:43 10/01/13.
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