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Make and model might help but here's two ideas:
1) Remove muffler and clean it. They can get plugged up with carbon and the saw will run at low RPM but will quit because of excess back pressure when you try to rev it up.
2) Set the high and low speed carb settings. Start the saw then gradually increase engine speed until full throttle. Screw the hi-speed needle in slowly. If RPM immediately drops, back it out until Rpm increases, then starts to drop. Screw back in until peak rpm reached, then starts to drop. Back out to peak, then 1/3 turn more.
Set low speed so engine runs smoothly but chain does not turn.
Hope this helps.
Check your exaust hose. Mine came loose inside the engine compartment and it caused the same problem. Would run great for a while, then just die or start sputtering like it was missing or the plugs were bad. After I let it sit for a while it would start up fine, run great for about 15 mins, then have the same problem.
Being springtime, I'm thinking you may have had your saw sitting all winter with last years gas in it. If so, you'll need to clean the carburator and spark plug real good, then put fresh gas in it. Always remember to run your saw out of gas before putting it away. Gas only stays fresh for a few weeks and will foul up your sparkplug as well as plug up the inside of your carb when it gets stale.
Why are you not standing on the help desk where you purchased this? If it starts to sputter then dies It is probably a plugged fuel tank vent. When it begins to act up roll the saw so the fuel cap is up right and loosen it a little. If it smooths out and runs correctly you just vented the tank and that is where the problem lies. If it suddenly stops running with no warning it is most likely an electrical problem. If you repair either of these problems it may void your warranty. Why not make Homelite repair or replace it? If offered a refund I would not purchase any product by the same manufacturer. At best their quality control is lacking. HTH
Sounds as if the gas tank is not breathing properly. The next time you run it, when it's about to die, loosen the gas cap. It should begin to run again. This is a sure sign that your gas cap is clogged. Clear gas cap of debris, or buy a new one.
Sounds like your ignition coil is going bad. I believe you can have those checked for free at your local auto parts store. When they start to go bad they will fail on you when they get hot but once they cool down they are good to go again. Let me know if you have any other questions. Thank for rating my response and for using FixYa!