alright guys im new to this site and kinda new in the game so i gotta a couple question. so here they are. i just recently put a b16 head on my b18c block. everthing went pretty smooth then i took it for a test drive today. well while i was cruising my speedo just randomly dropped to 0 and quit working on me and i have 2 step set up on my ecu so i cant go past 4000 rpms because it thinks im sitting at 0mph. also there is a slight miss between 1500-2500 rpms. i think it has something to my fuel injectors but im not 100% sure so if you all could please help me out. thanks