John deere 318 garden tractor

Check for intake manifold leaks between the upper and lower halves that are sealed with a bead of silicone.

Check timing and valve settings.

And, lastly, there's some tricky passages in the lower area of the carburetor that may not have been cleaned 100%.
 
That carburetor has an idle screw, and the first thing I would check would be try open the idle screw 1/4 turn and see if it does better.
 
I would do what trk and Bob suggested. Also, maybe try moving the governor spring on the top of engine to different holes to adjust tension.
 

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