MAP Sensor

What is a MAP sensor, what does it do, what happens if its faulty and its not fixed, how hard is it for me to fix, and what damage can it cause to other parts of the car if not fixed???

Manifold Absolute Pressure sensor.

it monitors incoming air at or near the throttlebody to help the ECM determine the amount of fuel necessary for proper combustion.

in coordination with a Throttle Position Sensor (TPS), Oxygen sensor (O2), Intake Air Temperature sensor (IAT), and Crank Angle Sensor (CKP), these sensors make up your basic ECM sensing system to apply the proper amount of fuel in correlation with the degree of throttle opening, amount of air ingestion, density of air ingested, proper ignition timing for optimum power without detonation, and finally monitoring of oxygen content in the exhaust stream to futher fine tune the fuel input and ignition timing for the most efficient and clean combustion possible in a wide range of atmospheric/ambient conditions.

if broken, the MAP sensor must be replaced. if not replaced, the motor will run poorly on a base fuel/ignition map as it has lost it's ability to measure the amount of incoming air, in turn rendering the motor incapable of applying the proper amount of fuel in all conditions. this results in extremely poor fuel economy, stumbling, bogging, hesitation, rough idle, poor emissions, and excessive buildup of carbon on valves, pistons, and exhaust system. long periods of excessively rich mixtures also degrades the efficiency of a catalytic converter and oxygen sensors due to buildup of carbon coating the catalysts and sensing elements that is irreversible.

Thanks for all the info....Can i replace one myself? Or am i better of going to a mechanic? How much should labor be for the job?

Thanks for all the info....Can i replace one myself? Or am i better of going to a mechanic? How much should labor be for the job?
if the car is a 1992 and newer, it's 2 screws an electrical connector, and a grommet.

you should be able to figure that one out.

It's a 1991.