My car is throwing codes 71, and 72. Those are the codes for misfire detected in cylinders 1 and 2. It is definatly noticable while maintaining a constant speed, with RPMs below 3K. It doesnt happen when I am accelerating, and it doesnt happen when I am above 3K RPM. I thought it could be the IACV, but it seems to be working fine.

The CEL always comes on between 2K and 3k rpms, and ususally takes about 25 minutes to come on after reseting the ECU. I tried gapping the plugs a little smaller, but I dont think it made any difference (.035).

Ignition includes:
MSD sport compact ignition controller
MSD BTM
MSD dist. cap
MSD external coil
MSD 8.5 plug wires
new rotor
2 step colder plugs

fuel management right now is only a 12:1 vortec FMU.. Could it be a fuel problem, maybe the stock fuel reg? I wouldnt think so since it never happens while in boost.

If anyone has any suggestions, please let me know
Thanks
Garrett