1990 YJ carb 4.2. Just started ticking out of nowhere. I want to say it began after the last oil change (done at Jeep dealership) but I can’t be sure. Its my better half’s daily driver so there is no telling when it actually started. Its does not do it at idle, or when you rev at idle. Only does it in gear over a certain rpm then stops when you let off the gas. It won’t let me attach the video. Any help would be greatly appreciated as I don’t know a thing about cars.