echo cs271 im stumped

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torence 20

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in need of someone smarter than i. im working on an echo cs271t. it will run great one minute then it acts like it starves for fuel. then ill restart it and it will run good and ill almost have it tuned then it will do the same thing. sometimes it will stay running and will idle and then as soon as i hit the throttle it will die out. i have pressure and vac checked the crank case. rock solid. i have tested the tank vent which passed but i replaced anyways out of frustration. i thought the fuel line may have been collapsing so i replaced that and the fuel filter. pressure checked the fuel line after install to make sure it wasnt damaged. i checked to make sure the fuel filter was in the bottom of the tank with no kinks. im stumped on this one. any thoughts would be appreciated. it always restarts and the way it dies does not seem like an ignition issue.
 
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