i have a volvo 131 i have heard that normal engine operating temp is 200 is that correct.also after running at full speed for 30-45mins it sort of chokes out and if i eaz of trottle it ok for a little bit then stalls i replaced coil clean carberater got new battery and put new points on and plugs look good inboard gas tank is vented at the back of boat is there somthing else i should do 