Ok I am working on my neighbors HRB 217. The original problem was it wasn't shutting off. I took the air cleaner off so I could see behind it. Found a wire that was unplugged and fixed that. When I was putting it back together the carb came loose and the heat shield and gaskets. I put it back on and now I get surging and some back firing. I could use some help with what to do next. Should I order new gaskets, I also noticed that the fuel line is leaking next to carb. Thanks for the help.