Borrowed a Stihl MS 270 from work for junking up my stash. It has a little more weight and power than my 250 so I like it for junking up the logs. Works great with my finger on the throttle but I can't sit it down for 10 seconds and it cuts out. Easy to start again but still, a pain. It has the 3/4 , 1/4, and LA adjustment. Where should I start? I checked the spark and cleaned the air filter. Thanks.