hey everybody. i've hooked an afr gauge up to my car and am working on getting my fuel dialed in just right, but i'm having a hard time understanding why my fuel pressure drops down to like 32 psi from about 40 psi. under hard acceleration i'm holding good around 39-40 psi and my afr is good, but as soon as i let off the throttle i go to about 32 psi and my afr goes totally lean. it does it at the same time...as soon as my pressure drops the afr goes high. what would cause this?? it doesn't sound like my fuel pump...could it be a faulty pressure regulator or something else? vacuum problem? i'm confused and its making it really hard to get this thing tuned!!