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Well my friend has a 2008 or 2007 dodge cummins 6.7, he purchased a MP-8 chip that is supposed to be a plug and play chip, but for some odd reason now that i installed this chip the truck does not want to start!!! I had to take of the front fuel pressure regulater bolt thats on the fuel rail and put three little shims inside it before the spring, i just dont know what the problem is can anyone help me??