It's a 1997 Tahoe
possibly you need a better grade of gas?
A ticking or clicking sound is probably lifter noise, the valves need adjusting
== == Could be a pebble stuck in the tread of one of your tires.The ticking noise only appears to disappear because the tone or pitch of the noise gets higher with speed to the point at which it is undetectable to the human ear.
nail in tire, or rock
Try to locate the ticking noise. Is it the engine? Is it ticking when you are driving? When you are sitting still? It could be as simple as a stone stuck in yoru tire, everytime it hits the road it ticks. it could be a lifter in the engine. Try to be more specific as to where and when the ticking happens.
Sounds to me like HOT exhaust cooling down.
In order to tell you that you would have to describe the noise and what the car is doing when the noise is made. Are you idling, driving, just turned the AC on? What is occurring and what is the noise? Idling and sounds worse when AC is on. Sounds like it is coming from the top of the engine. Vehicle has 120k miles
My car was making this noise when I started it up. the noise went away after driving for a while. turnd out I just needed more oil.
If you are driving the vehicle while ticking it could be that the engine mount is in poor condition.
if is a fast(constant) ticking sound which increases in speed as you accelerate then that sound most likely will be your lifters. they're not getting proper lubrication.perhaps you should either check and make sure your oil is not low and or concider using a thicker oil. 10/40.
the ticking noise is a small exhaust leak close to the exhaust headers or exhaust pipe near the engine.
Have valves adjusted.