I think there tracks are below sea level thats all

the z06 did end up with 112mph by the end of the day, and he believes his power is down, but not sure why?
If you unhooked the o2 sensors and it's the same then that's probably not it sky! When the car is running pull each plug wire off 1 at a time! If the idle speed doesn't drop then that cyl. isn't firing! If your car is running as bad as you say, i would do a compression check! I bet 1 or 2 cyl. will be real low! or someone is messing with you and messed with the firing order? 13726548 i believe is correct! good luck!
I'm pretty sure with some better weather and slicks i can get 117-118mph as well! I can't go to the track for awhile though as the wife is expecting to have our kid in early oct. so i don't really want it to pop out at the track
Leon