Just wondering if anyone can help me? I own a 99 wrx that has a 06 sti 2.5 short block with all normal running gear. The prob I have is when im driving in fifth gear at 100km an hour, or 60 mile an hour. The car seems to loose power, then down through the gears as I excelerate it seems to either miss fire or have a shortage of fuel? I have also heard a spitting noise. If anyone has a thought it would be much appreciated.