I just changed my throttle cable and wanted to make sure it’s set to the right rpm. The original cable was set way to low. 1600rpm full throttle suppose to be 2700. So I put to 2700. Did first job a 2 bedroom apt and seemed ok. Heat great vacuum seems the same. When I was winding up the hoses water started back feeding into my blower causing it to blow smoke and smell. It came out the front of my exhaust also. I cleaned up the blower filter and little belly water pools in my recovery tank and tried it on the next job. Even worse. More water more exhaust. So I had to clean at 1700 rpm. Anyone know what could be the problem ? It’s 9 years old 8000 hours and now issues like this before. Prochem haven’t helped much or my distributor. Any help is appreciated. Thanks