I just bought a new Mercury 9.9 4 Stroke and I ran it in a tub of water last Saturday. I had to choke it to start it of course, and after running it for 5 min. or so, I pushed the choke in and when I increased the throttle, I would sputter and die (like it wasn't warmed up yet). Is this normal. Does it take longer than 5 min. to warm up especially if it is only 45 degrees out? Just want to know if I need to have the dealer look at it.<br /><br />Thank you!<br /><br />-mdmataya