I recently got the '3 blink' error light for the pressure switch stuck open. Switch is good, made sure there was no obstruction in the condensate/drain line. Now the black wire connector to the inducer motor is sparking. I've tried cleaning the connections and scrubbing with sandpaper. If the connector sits in just the right position it won't spark and the furnace will operate correctly, but will often shut down after awhile giving me the same '3 blink' error. If I wiggle the black wire connector to the inducer, it will run but obviously this looks like it will be an ongoing issue. Any idea what is causing this spark?

I have a Weathermaker 9200 in a home a I bought 4 years ago in the Spokane, WA area. It has worked fine until this fall when it started making a lot of noise as it starts up. It kind of sounds like rubbing metal or vibration. Once it gets to speed the motor runs smoothly. I thought starting issues were probably related to the starting capacitor so I replaced it, it did not solve the problem. The issue seems to be getting worse. Slower longer noisy starts. It sounds like the motor is getting to full speed when it is running. I am starting to suspect the motor itself is the issue. I felt the exposed side of the motor today and noticed the shaft cover was kind of warm. I am wondering if the bushing or bearing is wearing out. I will post a picture of the furnace label shortly.