EU3000is running rough and idle hunting.

need to clean the idle jet out in the carb. you need to take the carb float chamber apart and you will see 2 copper jets. unscrew one jet at a time and clean them out. screw back firm not to tight. wile open clean the filter out of the main fuel line if its black replace with new one or leave to soak in some white vinegar and brush with a old tooth brush put new seal on float chamber and put back on engine. see if its fine then it should be.

With the engine running try spraying a couple shots of carb spray into the throttle body. If the idle smooths out then your running lean. The next step is to check fuel pressure, vacuum leaks, and try unplugging the upstream oxygen sensor. It could be stuck rich which would make the computer drive fuel trims lean.

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remove the idle air control valve and clean with spray carb cleaner.

Very easy to remove and disassemble the carb. Just keep track of every thing you did and where it went. It would be best to get the manual if you can.

The Tecumseh snow motors are notorious for idling rough. Especially the last few years of production. Most service techs just say "live with it" But there are a couple of things you can do to help.
It is not a carb adjustment issue. It's usually a fuel, clean carb issue.
First, use a premium grade fuel without ethanol and a fuel stabilizer. This will give you the best fuel mix.
Second, Remove the carburetor shield and clean the inside and outside of the carb with carb cleaner. Even though you can't see the carb usually, they do get varnish build up and cleaning it will help some.
Third, Put the recommended amount of fuel system cleaner in the gas. I use Sea Foam brand. Over a tank full or two you will notice a difference in how the engine idles.
Fourth, Use a high quality spark plug and use a new one every year. Make sure the gap is correct.
Good Luck! Feel free to as any other questions you may have. Don't forget to rate this answer!

Carb. needs cleaned, its starving for fuel and by choking it you reduce the air flow and increase the fuel.

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carb or Fuel injected try cleaning either one of these bad distributor cap or rotor or distributor good luck

This is called hunting, your fuel-air ratio is not right. Your carb. jets need cleaned

I would remove and clean the sparkplugs - sounds like one may be fouled.

Can anyone help me with the eco-trottle switch when I switch it on it seems to run the same idle whether I have it off or on, what could be causing it not to work, is it a bad switch or I am running 89 octane could that be the problem.

Thanks
Alex