I bought a 743B about 2 months ago and it had a little bit of fuel on top of injector pump. I ordered new "o" rings. My question is could this cause my 743 to lack in power? I drove bigger equipment years ago so I'm not acquainted with something of this size. Tonight for instance I was out moving a little bit of melting snow and under that snow is mud cause I finished building my new home late December and it wants to stall when going through thick mud ,is this normal?. Engine starts perfectly and exhaust fumes are OK.