25 hp johnson 1999. got it running this year but has been inconsistant. right now it starts and runs but is bogged down until i remove the motor cover. Then it ramps up and runs out great. Also when the cover is on and it is bogged down, it uses a TON of fuel. I have tried adjusting the carb, but that does not seem to effect much. last thing, sometimes to get it started i have to bump the throttle to full. what do you guys think???