I have a Homelite 18" Timberline chainsaw. When I first start it, it runs strong and idles fine. I adjusted the idle "T" screw out counterclockwise so that the chain doesn't move at idle. However, once I try to cut any wood at all, the saw will only run at high speed regardless of whether I pull the trigger or not. It will not idle down so that the chain does not move. I have tried to turn the idle speed screw out further but nothing helps. Any ideas would be helpful.

Thank you, Jack.