Have you checked the air filter? Or could be water in your gas, or if you bought gas from a station that carries gas with a high ethanol content it could be unhappy.
It could be your air filter is dirty. Some can be washed but new may be the better choice.
I will check it out. Thank you friends. This is why i love Hometalk.
My bet its the fuel also. The new blends tend to soften the rubber fuel hoses and gaskets inside the carburetor and that can cause exactly what your experiencing with your machine.
On that note, only purchase small quantities of fuel at a time and use it up. When your done for the season empty the rest in your car, and once the season is over. Run machine with a small amount of fuel additive unit it runs out of gas. Do not store any fuel in the machine for long periods of time. Or it may not even run next year.
continuous acceleration and deceleration could be an out-of-adjustment fuel mix screw.
guys, my filter was dirty. for now i just had it cleaned. will buy a new one later. thanks everyone.