Atmospheric pressure
The lack of air intake designed to flow into the motor.
Mass Air Flow MAF sensor could be your, problem check that!
Lack of coolant, lack of coolant flow, air in cooling system, lack of airflow over radiator,........
The land breeze causes the air to move counterclockwise
On a 2002 Ford Ranger : The Mass Air Flow Sensor is between the engine air filter and the engine air intake tube
it is because the Glottis briefly stops the air flow. that causes the air to get out hardly and causes the grunting sounds.
On a 1998 Ford Explorer : The Mass Air Flow Sensor is between the engine air filter and the big engine air intake tube
On a 2004 Ford Freestar ( 3.9 and 4.2 ) The Mass Air Flow Sensor is between the engine air filter and the engine air intake tube . It is INSIDE the removable section of the engine air filter housing
On a 1997 Lincoln Town Car : The Mass Air Flow Sensor is between the engine air filter and the big engine air intake tube
The mass air flow sensor is located directly in the engine compartment. The MAF measures the temperature of the air and the amount of air entering the engine.
On a 2003 Ford Mustang GT : The Mass Air Flow sensor is between the engine air filter and the big engine air intake tube
On a 2002 Ford Explorer : The Mass Air Flow sensor is between the top of the engine air filter housing and the big engine air intake tube