i didnt wanna post but ive been searchin for the past month about my problem...im runnin a b20b4 bottom and a gsr head...idk whats goin on but my motor wont rev past 6700...i have fuel and spark ...i messed around with my fuel pressure but no change...its hard to get started...even harder when cold...ive tried everything ...if someone could help me it be greatly appreciated...

 

what ecu do u have