I have a Kobalt single stage 60 gallon cast iron oil compressor. Couple of years old. I don't know if lowes even sells this model now. It will run fine with no load. It will run fine till it hits 80psi, then it slows down until it tries to slip the belt. It should pump the tank to 150psi or so. I don't know a lot about compressors. does this sound like something i can diagnose and repair? Thanks.