I have a Mexican 93 TII Spirit R/T with the SBECII. The OEM coil pack was not working anymore so I bought a replacement one from AutoZone while I got a good OEM one. I was running 17psi without calibration and it never ever hit over boost. When I installed the AutoZone coil pack, it started boosting passing 14.7psi. After I got a good used OEM coil pack, over boost was still there. Another weird thing is that the boost controller is not regulating boost anymore, so I replaced it for a new one and still doesn't regulate pressure.
I'm thinking that the coil pack could just be a coincidence and that it's something related to the wastegate that failed when I changed the coil pack.
Anybody have any ideas what could be going wrong or what I need to check?