so 96 GT failed etest by .05 on the Idle CO% see pic. (Pic won't load). All other test past except for CO% at idle....limit 1, reading 1.05 for a fail

Anyway, computer is telling me idle fuel pressure is only around 20psi. Aftermarket fuel rail gauge shows 22 psi at idle 800 rpm. Stock pump, stock injectors, stock fuel pressure regulator on a 91 octane dyno tune.....


Where do I go from here, anyone know what idle fuel pressure should be? And causes of low fuel pressure? New fuel filter last fall.