so heres my car 91 civic std
d15 motor tranny
pgfi
obd1 ecu and dizzy
so i just got the motor in and it want pass 4000 rpms its on a p06 with a d15 dizzy bolted to the head
basically stock motor just pgfi and obd1

whats usually the cause of this?
it would be helpfull if u could call me or just post it on here 8137707861