Used my 318 with blade on and with mower deck attached now after I removed blade the mower starts but then slows barely mowing almost as though it has stopped when I raise the deck it starts again. Blade is a 54" dual cylinder hydraulics. I am thinking I did something having the blade and deck on the same time but how is raising the deck connected to the mower? Any help is appreciated. Did not do this before so definitely has to do with blade on with mower deck earlier in day.