lock-tite
hey ian..
with the 3 or 4 bolts, back in the manifold, grab the pipe and try lifting up, if it moves, then you have issues with the motor mounts, also reach under the caeb area, and lift from that side as well. If mounts are good, then, think'n, you just need loct-tite to secure them in there. Motor puts out some vibration, so, if the bolts aint loct-tite or torqed, they will "back out"..