My JDM lude seems like slowing down. i didnt feel it but today a raced automatic Mercedes Benz C280 from a first gear roll and that automatic pulled on me in firs almost a car then in the end of second i managed to come back and then in 3rd passed him . damn, my car used to run stronger. there is some kind of black substance laid on inside walls of my intake manifold, that must be slowing down me a bit. is there any way to clean it withought removing the mani?

 

why don't you do a compression test to see if your engine is still strong?

yeah you can clean your intake manifold by spraying carb cleaner inside. this is why some ppl get oil catch cans

 

sea foam spray.. don't remember the exact name... works great too