CEL came on today and it threw a P0507 for IAC reading more air per revolutions then it should. Also 2 codes both for catalyst system below threshold (I assume from the IAC code). I get odd but on-point boost surges (at about 1900rpm boost pulls hard then at about 2300 it falls on its face, then 2500 boosts hard again) I drive every single day for school and work and need to figure it out quick. Car is 100% stock with 120k, but been taken care of its whole life. Any suggestions guys? And another unrelated issuse... clutch feels solid under normal driving but any sort of boosting about 3k rpm and it get super soft like almost not disengaging/engaging. I have to pump it 3-4 times and gets stiff again. Any help would be greatly appreciated. Thanks guys!!