2006 Cherokee SRT8 w/supercharger P0129 code issue

[CadillakJak]

Good morning,

New to the forum and a bit short on time so I apologize in advance if I'm in the wrong area or format. I bought my 06 SRT8 about 5,000 miles ago from Canada. It currently has 65,000 miles and is mildy upgraded with a supercharger and exhaust cut outs. I believe that is about the extent of the upgrades but I am no longer in touch with the past owner. I was in a parking lot and was having my Misfire code come up on cold mornings once in awhile. I went in to clear the code and for the first time decided to try switching the code from what I think was the 87 MPG option. I switched to a 91 Performance code and as soon as it wrote it the engine light, traction light and low barometric pressure light came on. The low barometric pressure code is now up on top of the misfire code and the truck runs horrible. It is my main form of transportation and I unfortunately have no one locally that knows these vehicles let alone with upgrades. Can anyone offer any insight or help into getting my normally very reliable truck back? It would be hugely appreciated. Have tried rebooting, resetting to other codes, etc. thanks in advance

RC
Plaistow NH

[Mike_Levy]

You can't run a canned tune with a blower. That truck needs to be custom tuned yesterday. You're gonna end up blowing the motor sky high. Of course the Barometric pressure is going to be out of range. Normal is 14.7psi. With the blower, you're seeing at least 20psi, probably more.