The idle control solanoid is bad or dirty,could be hung open. the base gasket under the TBI could be blown or cracked. NEUTZ
By the hissing noise it sounds like you need a new brake booster
You may need to check your brakes or the rollers on your brakes
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
That sounds like a stuck relay.
You need to replace your booster.
sounds like the door check has worn out
Sounds like the shock is loose, or the shock bushing is worn out.
It sounds like its coming from the tires More than likely its the wheel bearings or front drive axels.
98 Chevy new 383 block 30k, ticking noise from sounds like heads . 210k on heads;
Sounds like a valve,rocker arm, or a push rod is too tight.
Sounds like it is time for a good tune up including spark plug wires.
Coming from the front or back, is it doing it at an idle or just moving? Found out it was the break pads wearing out. Mine has the same problem. In addition to that, I can hear a very strange sound after stopping it. It sounds like the hot engine is contracting.