I feel like I'm losing power and the engine doesn't feel like it wants to rev as freely after about 1 hour drive. It only happens after driving about an hour. Also, there is no cel light or anything. After it cools, it runs fine again.

I'm thinking it might be some component that is about to break and only malfunctions under prolonged heat. Has anyone experienced this before? I'm thinking it could be either the Map sensor or the IAT. These components are the only things that I didn't replace during the swap.

 

[QUOTE=n1div]"After it cools, it runs fine again."[QUOTE]

Check your radiator fluid and everything? Not an expert but will need more info.

 

is it hard to start when it gets hot?

 

hey man it sounds to me like it's your catalytic converter it's probably clogged or getting clogged i'd swap it out

 

plug fuel filter
plug cat like krazycivic said

check ur fuel pressure when the problem occures

does it smell like rotten eggs?(signs of plug cat)if not take it out and look through it

 

heat soaked engine=less power

My engine feels faster too if i havent driven it for an hour.
Do a compression test if your that worried

 

Radiator Fluid is new and fine.

Starts fine when it's hot.

I'm running test pipe.

Fuel Filter is brand new.

It's definitely not the effects of heatsoak because it feel a lot weaker plus I have cold air intake behind bumper.

I do have a B&M FPR so I'll check the fuel pressure next time it acts up and see if the pressure is correct.

Thanks.