A fter giving this much thought and talking to a lot of mechanics I really believe I have a collasped lifter or faulty spring in one of my lifters because the noise started after the car down shifted on its own and rpms rose to about 4,000 traveling 65-70 mph. I really would like to try to pinpoint the noise to a certain cyl. by running with valve cover off and some cover to contain the oil fling while listening with stethoscope. Really thinking coming from 3rd cyl. If I can narrow noise down to certain cyl. how can I remove that lifter for cleaning and inspection or should I just put back together and run some marvel mystery oil through it and hope that fixs my lifter problem if that indeed is what I have? I'm thinking one of my lifters either has a broken spring in it or it is starved for oil and cannot reprime itself for some reason.