I have a 2003 Tiburon GT with 5 speed. Recently I installed an AEM cold air intake and Borla exhaust. Since then I have been noticing that when I accelerate in third gear the car hesitates and loses power between 2000-3000 rpm, after 3000 rpm it will accelerate again. It is only in 3rd gear. I just had the transmission rebuilt because my synchro was bad and the hesitation is still occurring.