The power is very weak in my VE past 3500 rpm even after I got the full 2 1/2" warpspeed exhaust system, a CAI, a Fidanza flywheel, a UDP, and a blehmco ground wire kit. I don't think my problem is the vtc's because the sound still seems to change at 3500 rpm and I don't think it is my knock sensor because I have a ton of low-end power. My car seems to be very moody. Even when the wheather is cold, it barely pulls past 3500 rpm. Rarely it has alot of top-end power like it used to have. I don't know what could be wrong.

 

auto or 5spd, if 5 spd check to make sure power valve is working

 

It's a 5 speed and I thought the power valve doesn't really do a whole lot until like 6000 rpm. Also how would I check it?

 

inadequate fuel supply at those RPMs?