yeah, it seems to be intermittent now. When I started it up yesterday...let it idle for about 5 mins and the sound did not happen. Took it out for a drive, it ran great, came home and parked. Popped the hood and all sounded fine. Then the popping started again...then it stopped. Its very weird...
Thanks for all the help and suggestions. There are no check engine/idiot lights so was told nothing could be scanned...