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Q: It starts up wide open with the trigger depress fully but when I release the trigger it dies.
A: The carburetor idle jet (Picture A item #27) is dirty/plugged. the carburetor needs to be taken apart and cleaned or it just needs to be turned out a bit to flow fuel or the idle screw that sets the idle speed (Picture B) on the carburetor need to be screwed in to open the flap a bit more. Your carburetor may not be like either of these two carburetors but close enough. If you need to figure out which carburetor you have to locate the idle jet look search for picture of your carburetor and that tells all such as in picture A.
Another couple things. In picture B you see the spring on the throttle shaft that closes the flap to idle. If that area is really dirty the flap could be stuck wide open. Make sure the it is free to open and close. If the chainsaw has had a lot of use the engine could be wore to the point at idle the piston isn't making enough compression for the engine to stay running even if you turn the idle speed screw (Picture B) in as far as you can.
Your carburetor is the problem. Either have it serviced or get a new carburetor. You can service it yourself, you will need carburetor cleaner, very thin gauged wire, air compressor if you have one to blow out the ports etc..
Also you can check out you tube for videos on how to clean a 4 cycle carburetor
1.) first check to see that gas is getting to the carburator
2.) check for a dirty air filter
3.)Take your carburetor apart, remove the bowl and soak in carburator cleaner
You need to take off your carburetor , disassemble it, and clean the jets (specifically the slow jet) and the passageways in the carburetor body that feed the gas to the carburetor throat. Carefully set your air screw setting back to stock setting. and reassemble. Inspect the intake manifold and air box tubes for cracks and separations. That should get you idling again.
Won't idle down: look for dry/rusted/frayed inner throttle cable. Look for sluggish fuel flow from tank for starting problem. May have to clean the carburetor(s) and fuel filter. Are the spark plugs clean and gapped correctly?
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