I have this ticking sound toward the back of my engine(not the lift pump tick; I have that too). I thought I was going to solve the problem when I found the #6 manifold bolts loose. Top one about 1/4 turn and bottom one about 1/2 to 3/4 turn. No change in ticking. Could the gasket have been ruined if it was only that loose and tightening up won't help or should I just say "they are torqued right now and that probably wasn't my problem?