Bobcat 36" Hydro WB cuts out while mowing, If the Speed control lever is pushed up past the lowest setting. Also With the speed control lever in the lowest setting and the PTO engaged the engine stays running when I release the OPC. I think there is a wire broken somewhere. Has anyone had this problem? The mower is approx. A 2004 model. it came with a 40" RAD snowblower. Pretty cool.