Cm871 codes 2961 2764 4214

[JetHauling]

Thanks for the responses. She has a very clean smooth idle, and like I said I've discovered that when the regen switch is in the off position she runs perfect like she should.. I'm going to change the back pressure switch and see how she runs tomorrow.. This weekend I'll check the "delta" tube again... Where is the Altitude sensor and how do I check this