I own a 2002 Chevy tracker Its making a loud hissing sound from underneath and barely any power from acceleration Someone please help

SOURCE: 2002 Chevy TrailBlazer Service Engine

This one is easy. The clutch fan is not disengaging. Mine does the same thing after it has idled a while but then will release (wind noise stops) after getting up to speed.

SOURCE: A rough idle

vaccum leak

SOURCE: 2002 reduced engine power light

You have some kind of ECU problem. You will need to hook to the diagnostic port to find the problem. Your vehicle has gone into limp mode. This enables the vehicle to run, but at a diminished level until you can seek help for the problem. Do not continue to drive it this way as you may cause damage to the engine depending on the nature of the problem.

SOURCE: 2002 mustang makes rattling sound when accelerating...

Possible bad motor mount(s) --only thumps or rattles when power is going to the wheels.

SOURCE: Loud Ticking sound 2004 F150

Check the Alternator / Powersteering belts .
One of them will be damaged and loose.
Hope this helps.