I've been out of the house a few days, and I have'nt read up on this thread completely, but I have a few things that might be of help for the vtec and iab issues.
you may know these things already, but just in case you don't......
with the VTEC pressure switch, there is a bypass. (not a ghetto bypass.. it's what Honda used to wire the Type R Accords that didn't come with a pressure switch... like mine) run a jumper wire between A4, and D6.. don't cut any of the wires, just run a jumper.. now the ecu won't look for the pressure switch anymore
I added a VTEC pressure switch for my H22. I of course ran a wire to D6 of the ecu, but then I grounded the other wire from the switch to the ground cluster directly below the switch location on the motor..
as for IAB's, when you start motor, is the diaphram sucked in all the way, (are the secondary's being held closed) if they are, good to go. if not....problem starts there.
on the iab's, I ran the pink to A17, just like it says to do, then I ran the other wire to the black/yellow wires that the evap purg, and all the other doo-dads in the black box hook up to...
I'll read up on the thread and see if I am just blowing smoke up my own ass or if I really helped..lol