I try to explain the best as I can, hope you guys understand.

theres something wrong with my gsr motor, its losing horsepower right now, really slow, I dont know why?? but I can feel looks like something block the intake or manifold or exhaust something...

 

Clogged cat?
-PHiZ

 

Are you secondaries opening?

 

Do a compression check.

 

do a compression test, cylinder leakage test, check the fuel pressure, and check the air fuel ratio. find what they should be and compair it to what you have. let me know

 

Well as an electrical guy, I always think the problem is in my arena... so here are just a couple ideas.

How did you wire up for knock sensor, that will pull timing and you will feel a power loss.

I think an O2 sensor going bad would also cause a perceived power loss, so would fouling plugs. Check grounds.

What does everyone think. The thing is, when I troubleshoot, I start with "what was the last change that could have affected things" With a swap, it's easy, cause there are a lot of wiring changes.

Now, I'm just discussing so don't flame me. But as far as leakdown/compression testing, there is no way it will hurt, and it's great information. But I don't specifically see the cause that would produce that effect.

-PHiZ