I have a new 5205 with 28 hours on it. It smokes at start up for a few minutes. After it gets up to temp. all is well. It seems to run fine. If I shut it off and let it set for about five minutes and start it again it starts just fine, but when I accelerate it starts bellowing white smoke acts like its running on 2 cylinders. Does this for about 30 seconds and then clears up and runs fine. All of this is with no load. Help!