...there are some possibilities...have to check one by one...but first u have MUT diagnosis at the Proton Centre..to confirm all the sensors (i.e TBS,TPS,ITS...etc) still functioning well...and from here you narrow down actual faulty...
usually its the throttle body...or yr timing too low...save fuel but no power & engine dies off easily....go get the workshop to check using pdt2000 or mutII
i'm havin headache on choosing the right turbine a/r for my gsr. any help dudes?? looking for 400 to 500 hp. running on hydra, super charge pistons, dura tech rods, acl race bearings. need anymore info's to decide??