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Thanks for your help, I’m new to typing on forums in general but what you have said has gave me a lot to think about. Still haven’t found where the mysterious plug goes to as Im not having any codes being thrown and the car runs fine other then a bad radiator that Im going to replace.
I too have a mystery plug that is just left hanging in the rear engine area. I searched for the mating plug, but came up blank. I suspect it may have been for a factory fuel pressure regulator, as I have the Aeromotive Fuel Rails & Regulator that was installed by the previous owner, thinking the stock unit had some sort of electrical connection. Im currently away from the car for a few days, so can’t take a picture. Although your connector seems like the one I recall. My car is an 04 impala
 

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