Got brand new Husqvarna 435 chainsaw and I'm loving it except for one thing. After I get it started and it's idling, when I try to press throttle it shuts off. This happens 2-4 times in a row after which I eventually get it running. I really don't want to return as I really like it. What can it be? Again no issues starting it, or running after I get it going, but it almost always stalls after I open throttle right after cold or warm start. I'm using recommended 50:1 mix of gas and 2 cycle oil, and of course I have bar and chain oil in the second chamber. This is my first chainsaw (not counting horrible cheap Poulan saw which I return after using for half a day).