Car is running rich... I think

[darkhorizon]

with the limiter set at 4k is a different story, but still, rev the **** out of it with no load (parked) and scan it while doing so and watch your knock go ape **** speaking on general terms.

You have no clue what you are talking about.

I would say that this is fairly normal stuff, and assuming you did not disturb the upstream O2 sensor, you should not be having any issues.