[GTR CRAZY]

Hi all just had a new clutch and flywheel,oil and filters changed and new trust iridiam plugs so i took her out for a spin last night and every thing was running fine but as i was driving home i kept getting a slight hesitation at about 2000rpm once past 2000rpm every thing was fine its only slight and feels a little like when a cars about to run out of petrol,any ideas?cheers craig