Lifter knock and injection clicking
 

My car suddenly started to make funny noises one day i started it. one of the sounds appears to be from one lifter or so, because it makes a tinyrapid knocks, and there is another funny noise when i start it, a series of rapid, loud ticking appears to come from the censor area on the intake manifold. Anybody noticed the same problem in their 3.0L V6's? what can be done? do I have all reasons to be concerned? I change oil very frequently on this engine, and always checks the oil level at least two times a week, so at least the engine's got oil, but what the ***** is that noise??? Please help me out here:eek: