Hmmm...well for starters I would have the starter checked and go get those CEL codes read at an autoparts store if you dont have a nifty lil handheld one of your own!! The sputtering before the 3000rpm normally it sounds like the spark plugs but since its having issues after that if you stomp on the gas...im not 100% sure!
You could also try some Seafoam...it cleans out your engine and exhaust and pretty much anything of any carbon buildup from it sitting so long...sorry Im not much help but those are just my opinions and ideas! 
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1997 Tiburon FX - HP Mafia Flag Girl
Motegi Rims-Toyo Proxy4 Tires
Clutch, Engine
Alpine CD Player
and almost here---header and intake
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SOON TO COME:
Cuda Kit (evofusion.com), Double Sided Carbon OEM Hood (flyryde.com), Paint Job (custom), Lowering Springs (possibly), Swaybars, Strut bars and much much more!!!
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