My name is Lori, I'm new to this site and I hope someone out there can give me some insight as to what may be going on with my baby!! I have a 2000 GT. She has some bolt on's. 373 gears, Pro 50 shifter, X pipe with flow masters. No converters. Cold Air, Throttle body, Pulleys, and SCT chip. I recently had a upgraded engine (same engine 4.6L) put in her with long tube headers. Had little issues here and there with the install. All minor things. The one thing I have going on now is the car acts like its not getting enough fuel to turn her over on the first crank. I have a new fuel pump and filter. I had a mechanic tell me it threw a fuel sensor code. He cleared and it did not come up again. I feel it may be my fuel regulator. But when discussing with different people of course I get different opinions. I was even told to check my egr valve. This is why I'm reaching out to my Mustang community. Any help will be greatly appreciated.