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idle pressure spec is 33-39 idle with vac line off the begi (leaking) I wouldn't worry about this much if the two valves on the fmu are loose.
but something is screwing up your idle mix. start there.
mix spec is .6 to 1% CO = 14.22 - 14.1 AFR = .976 - .959 L if you have the lm1 set on lambda
my car idled at 13.5 cold and after a few minutes would go to 14.5 -14.7 without running an o2 sensor.
edit, like i said in that note, removing the vac line should make your gauge read the static pressure. once you connect it back to the fmu the gauge drops to zero.