In addition:

Is the little fuel delivery nozzle clear? You can use a small piece of wire - like telephone wire to clean it out.

Is the arm that pushes on the piston moving? They can get corroded and stick in the "down" position.

Maybe your rebuilder left out the spring that pushes the piston back up.

If your rebuilder messed with the throttle adjustment that sync's the carbs, you may need to re-sync them to get the car to run right. LOTS of posts on the Vintage Forum on how to do that.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe