I just picked up a 17 foot larson with an 1988 85 hp force outboard for 700 bucks. I am trying to work out some engine issues. When starting I must shoot a little starter fluid into the carbs then it starts right up and idles just fine with the cover off. Once i put the cover on the engine dies within a minute or so. When I engage the prop it runs fine as well with the cover off. Once I put the cover on it becomes gutless.. Any suggestions? It almost seems as tho its getting choked out by exaust. The engine runs a little smokey so I leaned out the fuel and it helped a little but the problem still exists. Also when full throttle every once in a while the engine will cut out a little. I have replaced the plugs and fuel filter with little results.