I have a exmark laborz 60" cut mower. The throttle and choke cables have gotten hot and the plastic around the outside of the cable has melted. I thought it was getting to hot from the muffler but the dealer said he thought there was a short. They worked on it but same thing happened again. They went back worked on it again and found a spot where it was grounding out and fixed it. Now when we ran it the muffler turned red and it was popping and cutting out. Any suggestions. Thanks Joey