Hey all, I am hoping someone has a good ear and can take a listen to this. I noticed it yesterday when I had to slow down on a 15% incline in third, then got back on the gas without downshifting. I tested it out and I can only hear the pinging if I am on the throttle at lower RPMs. If I downshift, it seems to go away (or the exhaust volume is too loud to hear it). I get nothing at idle or cruising speed. If that embedded video doesn't work, here is a link to the video on Flickr: VID_20170709_173822497 Some background on the motor and jeep: I rebuilt it in 2002, and it ran for a few years every now and then, then sat for a few more, and now I am running it about 200-500 miles each year. (hopefully more now that I have finished all the projects I wanted to do) I put a professionally rebuilt carb on it 3 years ago and it ran rich until last week when I had my shop where I get my sticker adjust the air/fuel mixture for me. They said it was really dirty so when they cleaned it the idle was really high. Now it runs nice and smooth and doesn't smell like it is running rich. I just put a full tank of 87 in and the gas that was left over in the tank had Sta-bil in it since I don't drive it enough to go through full tanks of gas that often and that gas is a several months old since I was finished the roll cage and couldn't drive it during the spring. Any help would be much appreciated. Thanks!