1jz with a cold.
 

My supra has developed a nasty miss or hesitation during hard accelleration lately. It is worse in really cold weather where i only have to give it moderate acceleration for it to occur. It is not from the over boost fuel cut cause it still happens when i turn the boost right down. Just cruising along the car drives like a dream. Any idea's? Fuel problem? Vacuum leak?

boost leak...................?