ferney.archer

I have a 92 Prelude Si, everything in my car works fine, engine is completly stock exept for a radiator that i put in. My problem is that i cant go over 3,000 rpms. This started 2 days ago, it stopped then came back. My car makes this pressure lost sound, then i hear a clack clack clack. I've never had this happen before. Everything sounds good in idle, when i gas it, it makes the pressure sound and when i let go, right before it goes down to 1,000rpms i hear the claking noise. I can drive the car, its just driving really hard and wont go over 40mph.

Any ideas?
Thank you everyone. !