I have a 36" wb that on Sat. I was doing a cleanup and a storm blew in. I tried to finish and was mowing some wet grass that was pretty thick. I was mowing at 2". I did a pass and turned to come back and the mower bogged down and quit running. I thought I fouled a plug so I changed both of them and still won't run. Any ideas on what it could be? It is a 13 hp kawi.