When I boost and start letting off the throttle slowly just as it reaches the spot where the boost isn't needed it shuts of for a split second then kicks back in again same when you put the boost on slowly just as it reaches the speed your asking for the boost stop completely the kicks back in again as if is hesitating. Sorry for the poor description! Only codes I have is 0420 1243 I've changed the recirc I've changed the plugs and coil pack also the map sensor and I've checked all my vac lines everything is sealed don't know where else to go from here! 😔