I have an 05 merc 40hp efi tiller on my 16' boat. Recently on the water I began accelerating and soon after my rpm's dropped to idle and I lost all response in the tiller handle. The motor stayed in gear and will shift F N R but only in idle speed. I have no throttle response from the tiller handle and it is stiff/reluctant to move. Has anyone experienced anything like this. I am having trouble digging up any tiller specific info other than parts. I suspect a cable/wire is disconnected/broken? Any info would be appreciated, thanks!