That's not much of a post to diagnose your problem from...
Is this an I/O or an Inboard???... big difference!
If it's not a case of the motor "stalling" and it just shuts down, it's probably a case of a bad or misadjusted neutral position switch/cable.
Otherwise... it could be your idle or carb settings.
Check your idle rpm's, if they're in specs could be fuel pump, carb needs a rebuild, air filter,How old is engine? when was last tune up, Has anyone checked the timing? could be a vacumn leak. How old is gaswhat about apark arrester?
You're still not giving us much to go on......
If it's not simply dying when you put it in gear (at low/no throttle), I'd rule out the neutral switch thing..
If it's dying when you try to give it gas, it's likely the accelerator pump in the carb, or stuck floats.
What was the question got lost looking at eaglelarry's avatar. But yes sounds like a carb problem. Or check the compression on the motor. If the compression is low then you might not have enough power to move the gears.
I'll go along with the others and lean toward a fuel problem, based on what's been posted.
Be sure to check the fuel lines and fuel filter while you're at it. If you can pull the fuel line ahead of the carb and crank on it while holding a container to catch the fuel, it might give you an idea of how well the fuel pump is working.
when it starts it runs great fast idle in or out of gear but most of the time it just trys to start then the starter disengages and nothing some times the starter just clicks instead of cranking not often though