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If not already done replace the fuel filter in the tank, it is obviously fuel starvation, if no better increase the the fuel mixture on the H and L screws ( turn anti clockwise 1/4 turn on each to start with)
Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. T is the idle speed screw and not critical--just back off about two turns CCW at first. Turn H and L jet screws CCW from stops 1-1/2 turns each--this should allow the engine to start and run. Start the engine and allow to warm up--if the idle speed is too high or low, adjust the speed screw so that the engine continues to run, but the chain is not trying to turn. When warmed up, pull the throttle full on and adjust H needle CW until the engine starts to speed up. Proper final adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L jet screw CW until the engine idles fairly well, but still allows the engine to 'follow the throttle'. If adjusted too far, the engine will 'gasp' when throttled. Set the idle speed screw to obtain the above conditions. Hope this helps!
Start the engine and allow to warm up. Turn the idle speed screw (not the jet screws) CCW to reduce engine speed until the chain stops even hinting at running. If you get it too low, the engine will tend to die when it idles. Hope this helps!
Try venting the gas cap for a moment and attempt restart. If it starts, check for a plugged tank vent which should be a bronze disk set into the tank casting and located above the filler cap under the left side cover. When you changed the plug, was it wet with fuel inside? Also, check for spark at the plug when it won't start. You may have ignition problems that occur with engine heat. Hope some of this helps!
Sound like the carb was never adjusted right. Unfortuatley, the carb adjustment screws require a certain tool that's not available to the public. (EPA thing) You'll have to take it to a shop to get it adjusted. That should solve the problem.