I just put a new stock engine in my 2002 mustang GT. I changed stock exhaust to an X pipe with no converters but stock mufflers. I have a cold air intake with a 78mm throttle body. I was going to use my stock injectors but have found out 5 of them are not working. My question is should I go back with the 19 lb injectors or should I upgrade to the 24 lb?