They might be refering to the MAP Sensor.
A manifold absolute pressure sensor
(MAP) is one of the sensors
used in an internal combustion engine
's electronic control system. Engines that use a MAP sensor are typically fuel injected
. The manifold absolute pressure sensor provides instantaneous manifold pressure
information to the engine's electronic control unit
(ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF
(mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR
valve for functionality. Most notably General Motors uses this approach.
How the MAP value is used
The manifold absolute pressure measurement is used to meter fuel. The amount of fuel required is directly related to the mass of air entering the engine. (See stoichiometric
.) The mass of air is proportional to the air density, which is proportional to the absolute pressure and inversely proportional to the absolute temperature
. (See ideal gas law
.) Engine speed determines the frequency, or rate, at which air mass is leaving the intake manifold and entering the cylinders.
(Engine Mass Airflow Rate) ˜ RPM × (Air Density)
(Engine Mass Airflow Rate) ˜ RPM × MAP / (absolute temperature)
They could also be refering to the fuel pressure sensor. If so, then yes this also can cause the problem. You shoud have your fuel pressure checked for about $34.00. If you have a bad fuel pressure regulator you will need to change it out. If it remains undelt with then it could take out your fuel pump. Most fuel pumps are located and installed in the top of your fuel tank and are submerged into your tank. It needs the fuel to keep it cool, but if you continually keep your fuel under 1/4 of a tank you will drastically reduce the life of your fuel pump. Fuel pumps can be expensive to replace. I replaced my wifes in her 1997 Chevy Blazer and it cost me $350.00 (lifetime warrenty). If you keep your gas under a 1/4 of a tank most of the time and your pump is found to b bad then you need to opt for the LIFETIME replacement pump. You only want to have to pay for the pump once, believe me. Otherwise you really haven't provided enough of the symptoms to go on. Does it shut off when you are at speed, or stall when at a stop? If it stalls when you come to a stop you could have bad Oxygen sensor(s). If it's the oxygen sensor(s) then you should replace all of them.
These are merely suggestions.