Hey I'm a newbie here, and have a good question about my car cutting out at 4500 rpms. I just put a 3.8L supercharged motor and trans out of a 98 oldsmobile LSS into a 99 GTP (same motor and trans). I had to change a few brackets, pulleys, and mounts etc, but didn't change the throttle body. The motor ran just fine in the olds, but now its cutting out at 4500 rpms, no check engine light. Could the PCM have trouble getting signals from a 98 MAF or any sensor in the throttle body? It has the coil pack off of the GTP motor i pulled out, which ran fine till the crank bearings took a dump, but it had 228,100 miles. Could any sensors from the 98 motor cause this since the PCM is a 99?