I have a exmark lazer 48inch model number LZA20KAX484. The problem I am having is when I start it you to use it after sitting a few days the left side will not drive right away if I hold the stick front a couple seconds it will go,then it is fine, but if it sits a couple of days again it does the same thing but if you only let it sit a day or less it is fine. Changed filters and oil and still same problem. Anyone how any ideas? Thanks.