Unplug it, plug it back in and leave it to idle for 20 mins or so. If the idle isn't normal give it a few revs and let it run until it smooths out. Then take it for a gentle drive, first off boost, then gradually building boost up through the gears after about 5-10 minutes. Then take it to full boost and it should run well. Takes about 100 miles to fully adjust to your mods and driving style