Im trying to fix the in laws LA145. Its the 48" 22hp B&S. It turns over fine but wont fire. I have confirmed fuel comes out of pump, filter is new, plugs are new. I can hear the fuel shut off solenoid click every time the key is turned on and off, but haven't removed it yet. It will start and run if I spray starting fluid into intake. Im guessing the carb is gummed up. What you guys think?