All,
I am having trouble with a 98 Firebird with the V6. I am used to reading codes on my 3rd gen so this 4th gen stuff is confusing me. The car has very low power after it has been sitting in the cold for a while. If I disconect the battery (clear codes) it runs fine untill it sits in the cold again. Mechanic said it might be the TB but I am not sure. Here are my codes and descriptions;

P1220
Series Throttle Control System Malfunction

P1120
Throttle position sensor out of range

P1221
Traction Control System Malfunction

P1516
IMRC Input Error (Bank 1)

Thanks a lot for the help,
Tyler