Hi I'm fairly new to this site been reading and tried searching but haven't found an answer to my issue. I have a 16hp Briggs Vanguard in a 453e Terra Jet. It runs amazing at idle but when you rev it up or press down on the gas pedal, the engine seems very sluggish and slow to build up its rpm. It doesn't backfire or spew out smoke, it just takes a few minutes for it to slowly build up enough power to engage the clutch to get the Terra Jet mobile,,,but even then to me anyway doesn't seem to have full power or the power it should. Also thought the throttle response time should be way faster. I'm not a mechanic so easy on me or "dumb" down your answers for me please LOL I have this machine because I would like to use it for ice fishing. Lots of room on the lake to turn it around LOL Thanks in advance for your help