ok i just installed my plenum spacer last saturday and so far i love it but one problem, sometimes not all the time when i step on it and go through a couple of gears at high rpms then go to brake my car will kill the engine. my car will start back up fine and there is no cel. what could this be? something to do with the maf possably? someone please help me i would be very thankful

 

anyone have any idea?