I have the same model mower and had the same issue with it running for a few secs and cutting off. I removed the air filter and sprayed card cleaner in the hole. I let it sit overnight and then tried it in the morning and had to spray more cleaner in the air intake hole. The trick is to force the mower to get gas by holding you finger over the air intake hole for a second or two when the mower start to die. Keep doing this. This will force it to clean out the gunk. Keep playing around this way and like me you might not have to rebuild or take apart the carburator.
-BIll
Bill Pepitone, August 2006