[Mike/NY]

Thanks for the replies guys. It does seem difficult pinpointing the noise. The fact that you cannot hear it all the time would suggest something outside the motor I guess which is good news. I need to get under the car while the engine is running WITH RATTLE rpm to investigate, I have my dad’s old stetoscope and will listen to intake as well but prefer not to pull it yet though it is not such a big job. Maybe I’ll drain the oil just incase to see if there are any loose particle which I doubt. Any additional ideas welcome.