Well pressure is basically extra air
no, its not.
pressure is the measurement of force of air NOT getting into the motor, as measured at the map sensor.
pressure (psi) and volume (cfm) are NOT similar units of measurement
if there isn't enough fuel the engine heats up quicker which (if you're stupid enough to not notice) could melt the engine components together.
while this is somewhat true, its egadderating at best.
air doesn't compress on its on. blow up a balloon, and squeeze it. chances are it won't pop, but the air moves around to fill the other areas. the air stays the same.
when you fill the combustion chamber with air, and then the piston comes up- the area for that air to go to doesn't exist (cyl walls aren't flexible like a baloon).
the air will not ignite on its own. it needs the fuel in there to burn it away and create the power stroke.
if there's SOME fuel there, it will combust some of it, but there's still un-burt air in there that has no where to go.
This leads to detonation and the ultimate demise of your motor snapping rods and blowing out the cyl. walls through the block.