I have a 99 wrx that has a 06 2.5 sti short block with almost all standard running gear. The prob I have is that when im driving at 100km hour or 60 mile an hour, the car looses power. It seems to either miss fire or has a fuel prob. Then when I downshift the prob continues. Ive also heard a spitting noise from the engine. If I pull over and stop, then get started again it seems to go away but only for a short wile. any help would be grateful.
Ps. Im using more fuel