Just went to take the glanza out to meet a few friends.. Off I go all was well, about 8 miles into my drive and I come off a corner and hit boost.. It popd and banged and hesitated then stopped and carried off but by then I had let off the throttle. I carried on, for some reason.. and eventually pulled over to see what was up, when I pulled over the idle dipped right down and was hunting from about 800rpm to 1000rpm. Sounded proper shit. I duno what the problem is!? All vac pipes are on, everything I can see visually is on and secure. The only thing I haven't done since putting the new engine is turn up the fuel pressure to what it was on my old engine (4 bar). It's currently on 3bar, so would that be the issue? The fact I boosted at over a bar of boost on only 3bar of fuel???? Running a jam fcd too if that helps anything. Limped it home, proper jank!! Idles rough and hunts the same. HELP!!!