Echo trimmer starts but will not rev.

Links to products I have in my tool bag.
Compression tester. https://amzn.to/2NMgeze
Spark Checker. https://amzn.to/3bnXjmA
Tygon Fuel Line. https://amzn.to/3aCGntm
Carburetor Adjustment tools. https://amzn.to/3k7cgxe
Primer Bulb. https://amzn.to/3dC0WYK
Fuel Filter. https://amzn.to/2ZC0T7i

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Thanks for watching. This echo trimmer was running and worked just fine but while being used it started to loose power and finally died. It did start back up but didn't have any power and would rev past idle speed. As a disclaimer remove your spark to test that it's your problem, then clean and replace it.