slowyellow03

Was driving last night, check engine light came on. So I pulled into wal-mart and put my programmer on it. It had couple codes for o2s and lean code. I check my tune and it was on race fuel. So I put it on 87 oct. Got home check engine light was back on. Same codes. Cleared all the codes returned car back factory tune and drove to work this morning. No codes, but car is slow as hell. Any ideas.

cliffyk

What are the codes? There are a dozen or so "codes for o2s"...