pac'em out

Thanks, Mark. I'm running an 2005 6.0L. The atmospheric pressure makes perfect sense...I'm at 6500'. I have the truck idling right now and EBP is 14 and MAP is 11.7. Does this indicate an issue? I'm troubleshooting a rough idle, shuttering at 50mph, low power, and stalling.

First off, I will assume that your vehicle does not have the "Inferred EBP strategy". Normal EBP signal reading should reflect atmospheric pressure with the key on/ engine off. Typically, this is 14.7 PSI (0.88-0.9 volts) at sea level, decreasing one PSI/0.10 volt for every 2000 feet of elevation. It should be within 0.5 PSI of BARO and MAP sensor pressure signals. At Idle, it should be at around 16 psi. The operating range of the senosr is 8-99 psi. The values when driving depend on engine load and boost.