Just as a tip, if you start your car and you hear a ticking/clicking/ etc at idle and low speeds, either CHANGE YOUR OIL or CHANGE YOUR OIL'S WEIGHT. Especially if you decide to come through my job's drive thru; I can't understand what you're ordering. If you continue to let it go, eventually it'll result in cam lobe wear and your valve might even drop into the cylinder. Fix those noisy ass lifters....change your oil. Also you'll notice a strange, completely unrelated increase in order accuracy when going through drive thrus. /pointless ass rant
Theres thousands of other things that could be clicking other then the cams. The lifters are the most common actually.
Oh, yeah, I forgot to mention that was the whole point of my post.....your lifters are clicking lol. Cam lobe wear and valves having sex with cylinders are the consequences of letting this go on for too long.