Thanks, Rick but do you know for sure or just asuming.
Could you be more specific, what sensors, where. It apears the Air Temp sensor is located before the EGR inlet. The EGR Sensor only senses the valve being opened or closed. I realize that blocking the vacume line will through a CEL and cause the Res flaps to default wide open. But with the EGR in place blocked and fuctioning, there may not be anything to detect the lack of exaust in the intake.

All this is of course for off road use only.