Hi, this is my first outboard its a 95 merc oil injected 90hp. It hasn't been run in years. I changed the gas tank bulb and lines going to the motor with merc products. filled the oil reserve and changed the lower unit oil. It idles and runs good with water muffs on. When I get it in the water its a very sluggish start I can put in gear with it at about half throttle and stays at sluggish and eventually speeds up to match the throttle position. I can then get it up to WOT but it will die after about 15 sec. This is very consistent. I just need someone to point me in the right direction as to where to start with this? I think the obvious fuel.