On my 1997 Pontiac Firebird 5.7 V8. Where are the O2 sensors located?

I need to change them, but need to know where they are, and what I need to do the job. Any pointers would be nice also.

Answers:

New Brake Rotors for a 2002 Toyota Tacoma? Which brand is best?

O2 Sensor? Probably NOT the problem.
People like to blame the O2 sensor for the problem because that's where the computer fault appears.
However, nine times out of ten, it's not faulty. It is simply reading a condition in the engine that is causing it to send a signal to the computer that there is a fault in the exhaust emissions mixture.
A fouled spark plug, loose spark plug wire, a vacuum leak, dirty injectors, EGR valve, weak fuel pump, dirty fuel filter, weak ignition coil, plugged air filter, on and on, can all cause the O2 sensor to register a fault code.
Before you yank the O2 sensor and replace it, check the basics first. Otherwise, you could have wasted time and money on the result, not the cause.

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My car starts to shake when I hit 55MPH--what could be wrong?

Check on the headers near the collectors or maybe right before the catalytic converters.

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How much does a carwash cost?

front part of exhaust, looks kinda like a spark plug with a wire on it

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