Gas trimmer runs erractically

check for a fuel blockage , main jet or float needle and seat
check that the carby mounting screws/ nuts are tight so that the carby is not loose

Contact the consumer desk.

TB22 EC Curved Shaft String Trimmer by Troy-Bilt

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25cc, 2-Cycle Gas Trimmer / Attachment-Capable Design ... The TB22 EC gas string trimmer is both JumpStart™ and TrimmerPlus® attachment capable, making ...

Gas Trimmer ' TB635 4-Cycle Curved Shaft ... - Troy-Bilt

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Troy?Bilt Products
Rating: 3.3 - ‎32 votes - ‎$179.99 - ‎In stock
The TB635 EC curved shaft gas trimmer with SpringAssist™ technology features the new Click N Trim™ bump head, making line replacement easier than ever. ..... next one they put on - will only run for about 4 seconds. they've had for about 2 ... Both String Trimmer and Edger work great, easy to start and very low vibration.

Check engine light, running extremely rich or lean,bad gas milage....

4 cycle engines do not run on mixed fuel. Run on straight fuel. They have a spot to put oil in just like a lawn mover, and should be changed regularly. @ stroke engines run on mixed fuel.

I would suggest cleaning the carb (remove it) and air filter. There are a few really small passages in the carb that need to be cleaned which get gummed up due to the 2 stroke mixture and sitting for the winter. (Even if you drained the fuel)

DO NOT use a piece of wire or anything to clean out any small passages. Use carb cleaner and compressed air, put it back on, and see if it's better.

If that doesn't do it, a carb rebuild is in order. Not very many parts on those little buggers. If the cleaning doesn't solve it, it's most likely a bad diaphram from sitting and drying out. (Which I'm learning towards due to the lack of pressure when you prime and having it starve for fuel and die after a minute of running). There is a square plate on the bottom of the carb held on by 3 or 4 screws. That's the cover for the diaphram. Remove the screws and plate and look at the diaphram to see if it has a hairline crack, if it's sticking (there's a spring under it), or if any thing else looks out of whack.

Yes.

Sensor feedback to the computer is bad, so computer unable to control the idle speed.

I would check your thermostat. Even replace it if its not that expensive. Hopefully its not a heater core. Good Luck..
Have a tech check it out...

Are you saying that this is a brand new trimmer or is it new to you, used trimmer? You are describing a problem that is typical of a used trimmer.

This is a sign of a clogged gas cap. When the gas cap can't breathe, it chokes out the carburetor.

Try this: The next time you run the trimmer, and it starts to die, loosen the gas cap, it should start running again.

Jim

You have a clogged gas cap. Try this: The next time you run your trimmer and it starts to die, loosen the gas cap. It should start running again. It sounds too good to be true, doesn't it?! Well, give it try. Clear the breathing holes form debris, or buy a new gas cap.

Jim

My straight shaft trimmer will idle but dies when the I pull the trigger.