The SAFC2 is unacceptable for tuning boost. I know I did it on a Contour. I also used a MSD digital BTM to control timing. This was before Ford Chips. Once you dial it in at 7psi it will not compensate for higher boost levels. You will be stuck there. Also, there is no stalling if you tune a chip correctly. Don't half ass this or your engine is going to blow. Please trust me on this I've tuned a couple of boosted Fords.
