Engine oil Pressure gauge-sometimes it sticks at 0; when I tap on the gauge it works and the needle responds like it should; it may work correctly for awhile and it starts up again. I recently had my transmission rebuilt and there were a couple of very small vaccum hoses replaced and after that the guage worked great. I do not think it is the gauge itself.
A faulty mass air flow (MAF) sensor can cause erratic/rough engine operation and fuel economy issues. Since this sensor measures the actual amount of air entering the motor, when it fails, the engine control module (ECM) takes the wrong information and delivers incorrect volumes of fuel to the cylinders.