I have a 200hp Johnson ocean pro 1995 that I have not used over the winter I start it up and let it run on an hose for approx. 10 mins once a month. The last two times that I have ran the engine it will not idle under 2000 rpms at first i thought the choke was sticking but I pulled the cowling and it appears that there is no choke linkage.Is ther something that I could look for before thaking it to the shop.