I'm helping someone with a 2002 camaro LS1/4L60E swap into a 99 S-10 extreme. The 411 PCM used came from an 02 camaro. I used HP tuners to kill the VATS and after the flash everything worked fine until the truck was switched off. When you restart it the speedometer and cruise stop working. With a scanner connected VSS always shows the correct speed. I did a write entire and it works until you turn it off and restart the truck. We switched the pcm with another one from an 00 camaro and the truck works correctly.
Any ideas what would cause this??