I am putting stock injectors in at the moment on my project. Why do they feel loose. I have the insulators on the bottom of themand also the plastic spacers where the fuel rail bolts to the manifold, but even when tightened, ican see a gap at the bottom of the injectors. also i can spin them freely? Is something wrong. Im thinking the spacers dont go, but when i take them out the bolts wont tighten all the way. Is there a diff. size spacer?