so the regal gs had a vacuum leak the vacuum line that goes from the fuel pressure regulator around the front of the engine was all crack at the fittings the gm part number is 24508742 should be the same on gtp 41 bucks in Tempe gm dealer and it was in stock !! car was driven from Edmonton Alberta on November 08/21 as the border opened up we were there at 4 am and it didn't take long to get through drove to Page AZ, the next day we stopped at horseshoe bend then the grand canyon then went onto Maricopa AZ 1900 mile drive