Need help! I picked up this mustang cheap ran a little rough but I figured I could look into it and fix it I started with the fuel system when into the top app replace fuel injectors the fuel pressure regulator and EGR valve when I put it all back together started the car found that cylinders 1, 5 and 7 had not been firing raw gas was on the spark plugs my checked for spark on each cylinder since injector number 5 is the easiest to get to I put a noid light and check to see if it was working and it was flashing with the car on I'm so lost I don't know what to do anymore where do I go from here anybody have any clue or may have experiences