stock usdm b16 30-38 psi vacuum line unhooked and 40-48 hooked up. i have mine on the lower side like 29 psi because i was running rich as hell so i leaned it up a bit. also the other person is right about the head being decked etc but i also know you can change the idle when adjusting the timing because i have noticed it before. it has to be one of the two things for sure. why wouldn't you be able to time it with a timing light? are the marks that jacked up on the swap or what? if he has the ecu jumped and moves the dizzy according to a timing light the idle might come down???