I just bought a 2004 6 3.0 with 134k miles on it. Sometimes during cold start it makes an odd rattling noise for a second, and also a noise at 1-2k revs sometimes when warm. The car is throwing the p0345 (cam position sensor circuit ) and p0012 (intake cam bank 1 over - retarded). The car runs great, never had a vehicle pull so hard when accelerating, never had it fail to start and it always idles smooth. I can confirm at the moment there is an exhaust leak, and I am repairing that shortly but I don't think these noises are related. I have seen threads with similar symptoms saying that it is the vvt actuator but they are all on the 2.3l, and I was wondering if the same applies to the 3l and how expensive it is to replace if it is bad.