I recently purchased a Stihl MS-251, and it worked great for the first couple days of use, but now it's idling very hard on startup and the chain is spinning when no throttle is applied. When I do apply throttle, the engine dies. I've only filled it up once, so i thought it may be the fuel mixture, but it ran fine for about 20-30 minutes after I filled it. I looked down after a cut and saw the blade was still spinning after I let off the throttle. I've tried adjusting the LA screw on the carburetor but it doesn't seem to change anything. It's a new saw so the clutch springs aren't the issue (I also checked them just in case). I have a 2 gallon gas can that was filled to the 2 gallon marker, and i added 2 of those stihl brand oil mix bottles (2.6 ounces) which should get me close to 50:1. Not sure what the issue is. Any help would be appreciated.
