I have a 4.3 GXI-E it is a 2006 motor, the boat shop said the fuel pressure regulator is bad and that is why it is not starting but no one in the state has the part, they all have to order. I have heard a friend of mine that told me that if you went back 10 yrs on a 4.3 Gm motor some parts are the same. I have once used an air idle control value that matched up just fine and had no problems. Has anyone else ever done this? If so do you thing the fuel pressure reg would match up and work correctly?