It's a 1998 SS with 65k miles. Turbo @ 10 lbs. Supporting fuel mods but no internal engine mods. Dyno tuned to ~500 rwhp.

It runs excellent and has the whole time I've owned it (1 year), just gets a little stinky at idle. The wideband shows 14.5 - 15.1 while cruising, light throttle to coasting; and 10.6 - 11.1 at WOT.

At idle it seems to stick around 12.2 - 12.7:1. At idle with the A/C on it comes back up to 14.6 - 14.9:1. Turn the A/C off and it dips back down.

The guy I bought the car from said they were having trouble with the AFR's on the dyno and ended up dumping the maf and using a map/speed density tune. It was tuned in 2005 by a very small (now defunct) shop in Midland, MI before the car was stored for 10+ years.

I love the car and it's a blast, this is just a nuisance issue more than anything. Thanks for any input.

Ferg