So I have a weird issue with my car that has recently cropped up. I installed a JoeP MBC incorrectly a while back (noticed due to the boost reaching 14psi at one point). So I kept it out of boost for roughly a month due to not having time to remedy the issue (lack of time and vacuum hose to reroute the way it was set up). So here's the issue. I never let it get into boost the entire month. I just reinstalled the MBC two nights ago. It *seems* to be working fine. I have it set for roughly 8lbs of boost. When I accelerate hard, it goes exactly to 8, no creeping, spiking nothing. However, my idle has become EXTREMELY choppy, and when I shift gears, the RPM's drop extremely fast, and if I don't shift fast enough the car will stall within a second. My idle right now is roughly 450-500, and it dips every couple seconds, nearly stalls and then climbs back up. Spark plugs are brand new as of about a week ago, and there are no vacuum leaks. Vacuum is a good -25hg under decel and -24hg at idle, which is what it has always been since I installed the gauge. Does anyone know what this idle problem could be? If I drive normally the car won't stall, so it only seems to happen when the clutch goes in after hard acceleration.