i have a crx hf with a d15b in it when i bought the car it was running a HF ecu and im pretty sure it has a hf throttle body and intake manifold when it was runnign on the hf ecu if would stumble at low rpms and when i would get off the throttle and back on it would sputter putting the si ecu in it the car ran perfect tell today it now over heats at high rpms but goes right back down and at a stop its fine. so what is wrong with it and what shoudl i do to me it seems like the motor isnt getting enuf fuel and also what throttle body and stuff should i put on it since it is a d15b

 

vtec baby!!!!