I recently knife edged the throttle body butterfly valve on my 68mm throttle body and ever since then my car seems to idle quite high (1200-1600rpm). I made sure not to reduce the diameter of the tb plate and there are no leaks in the hoses that attach to the tb+maf. The funny thing is this only seems to happen sometimes, then other times the car will idle normal and all will be right with the world, this leads me to think that its some kind of software issue, would this be something a tune would remedy?

btw other than this mod my car is a stock N/A.