The MAP sensor in constant volume (gasoline) engines are always located in the admission multiple and on constant pressure engines (diesel) is located inside the EDC (Diesel electronic control) in your case it would be to be in the multiple of admission and be 3 -way if it is only MAP, and if it brings included the IAT sensor to be 5 roads. Please specify the motor code, which comes out under the hood or vehicle documents
now regarding your problem,
the MAP sensor is a sensor that measures the absolute pressure in the admission multiple. MAP is abbreviation of manifestation pressure. The MAP sensor measures the void generated in the admission multiple through a hose that connects both components.
When there is a condition of low motor load and a high vacuum, the command unit is responsible for impoverishing the combustible air mixture and the ignition progresses in order to achieve a greater fuel economy.
On the contrary, when a high load and a low vacuum is generated, the command unit enriches the mixture and delays ignition synchronization to avoid the phenomenon of the detonation.
It is very likely that it is the MAP sensor but, I recommend that you make a flight record with a SCAner or a resistance measurement with a multimeter between the sensor pins with the engine in Relay and verify it with a database of the sensor parameters according to the brand.