I start the scooter up fine and when i let it idle it just cuts out same when i rev the throttle what is the problem here

Condensation from inside the gas tank has probably made it's way into the carburetor. There is probably a drain screw on the carb float bowl. Drain the bowl, let it refill with gas, then see if the problem has gone away. Also, it may be time for a new spark plug. If none of that works, remove the carb then remove th float bowl from the carb and clean the carb with spray carb cleaner. Spray into every little hole in the carb. Below is a generic diagram. Please rate my answer. Thanks!

Has the scoot been setting for more than a couple weeks? If so, you have probably gotten gummed up gas in the carb/Fuel injection.

My tried and true fix for this is Sea Foam, Lucas, or other good carb/injector cleaner, with SeaFoam being my choice. It is a petroleum base, so you can't put too much in. You can add it to your existing fuel. If the bike has been setting up quite awhile, dump a half to full can in the fuel tank, start the bike and run at high idle. after a few minutes, try to accelerate. You may have to run at high idle for awhile to get the SeaFoam into carb good. After ten to fifteen minutes, it should be good enough to let set for several hours. Start bike and try to idle and accelerate.

If after several hours of running and letting it set, if it hasn't done any better, you may have to readjust the idle and air fuel mixture. If that doesn't do it, your carb may need to be torned down and manually cleaned.

Good luck