Need help with MAT sensor!

[kowe69]

I have a 2000 7.3 and it reaches a full 15 lbs of boost but feels like it's still lacking in power. I noticed that the MAT shows consistantly 65 deg F higher then every other temp sensor on the truck. Example: The other day it was 100 deg outside. The eot, trans temp, IAT and ambient air were all within 5 deg of each other. Except the MAT said it was 165 Deg. I checked with my infered thermometer and the manifold was infact 99 deg. I first disconnected it and the MAT-V read 4.6 V and then I shorted it and it read 0 v. So I'm assuming that I have just proved out the circuit right? So I changed the sensor and it still reads high. Does this mean the PCM is bad? Does anyone have a referance value for this sensor at any given temperature? I still plan on checking the circuits with my DVOM as soon as I get a chance but if anyone has any expearience with this problem please help!

Thanks
Ian