I have yet to connect with TunerPro RT on my '90 C4 but I don't play with it very much. I'd be curious if the Firebird would employ a CCM whereas a Camaro wouldn't with the my line of reasoning (but could mean nothing) certain years between the 2 I seem to recall 1 w electronic speedo and the other cable driven. If for some reason any of this holds water, I know one of the workarounds is to make sure the engine is already running before you start datalogging as a start/restart of the engine would reset the CCM chattering. BTW...I've had luck with ALDLdroid. I believe you can still download an ADX from John's site and see if it would work with TPRT.