Greetings everyone, just joined the other day after I found the web site and wanted to see if anyone out there has had the same issues with a briggs 18 hp vanguard engine. Mine is three years old with appx 150 hours on it. The motor seems to under powered when going up hill or pulling something, like it wants to stall or die. It starts fine and runs perfectly under normal mowing conditions, but under a load she is quite sluggish. I have a 16 hp vanguard in a broadmoor which is 14 years old and it seems to have more power than this 18 hp. Any thoughts?