My Setup:

- 2000 EK hatch
- JDM GSR motor
- JDM ITR ECU

I have noticed that my car really slumps down after it's been running for a while. The car is not misfiring or throwing codes, just that it seems to slow down a bit. In the mornings, just after the car reaches reg running temp, i can really feel the pull. But once i drive with it for a while, the car starts to loose it's punch. It occurs to me that this is a heat related issue. Does any experience the same symptoms? Is there is fix?

Thanks.