I have a GSR and when I drop it down all I get is studder like little backfires sometimes it does it sometimes it doesnt depends on the temp of the motor or the temp outside I guess my last known problem was the TPS sensor (throttle position) so i replaced that on the throttle body and that took away alot of the hesitation but I still have it from time to time Im not sure what the problem is so Im going to replace my whole fuel system ie. aem rail and pressure regulator and bigger injectors, possible changing intake manifold and throttle body, If that doesnt solve my problem I dont know what will do any of you have any ideas, something I may have overlooked thanks for your help