I have a Toro 22” mower with a Koehler PH-XT-675-2834 engine.It would not start and I installed a new carburetor.It started every time on the first pull after I installed the new carburetor for about 3 or 4 days. I had not used the mower for about 3 weeks and tried to use it this morning and it will not start.Spray a little starting fluid and it will run for short time.The carburetor surely can’t have gone bad in this short period of time.Any suggestions?