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Chevrolet Trailblazer Map Sensors Available Here. MAP sensors, or manifold absolute pressure sensors, play an important role in ensuring your vehicle’s engine performs at its best efficiency levels. In automobiles with fuel injection systems, the manifold sensors relay information to the engine control unit which in turn adjusts fuel supply according to your engine’s mass airflow rates. This is to guarantee that the mix of air and fuel is at its optimum. Rough idling, hesitation, difficulty accelerating and increased fuel consumption are all symptoms that your sensor needs to be swapped out straightaway. Thankfully, MicksGarage.com carries a wide selection of the highest quality MAP sensors you’ll find on the market.