I have a 1993 GMC Suburban with TBI ECM 16168625. I purchased the APU1 and read the prom code, flashed the new prom attached it to the G! adapter with the original prom. I used the A201_E6_v250 ADX file and the E6_TPV5_v250 XDF file. It uploaded fine and I checked it with the verification tool it was successful. When I install it in the vehicle the check engine light comes on, i get no aldl data and the transmission is stuck in third gear (default) If I remove the original prom and install it without the G! it operates fine, I get ALDL and the transmission starts in First gear and shifts. Can you guide me where I went wrong? The prom ID Is BHAS. I was not able to find a bin file online to match it so I purchased the HDR1 to read the original. Thanks for whatever help you can give me.

Herb