I noticed there was a 3 gms/sec discrepancy between these 2 and am wondering what I can do to get them closer. I'm using the 12613248 OS with a 1 MB PCM to control a stroked 2002 Z06 engine with ported heads and a 228/232 .615/.600 116.5+3 camshaft and a ported throttle body. Yesterday I experimented with the IAC effective area yesterday and was able to get it closer by moving all the cells down 5 or 6 places but that doesn't seem like a good solution to me. Log_0100a.efi82 Corvette baseline_0016.ctz