hoping for some help, I swapped an 01 cobra engine and t3650 trans into my 01 gt and I’m having idle issues. It hangs at like 1800-2k a lot of the time, but when I press the brake pedal all the way in it will slightly drop. I’ve replaced the iac valve and gasket and no change. It has a C&L cold air kit on it (which is getting replaced soon bc it’s junk). Just wondering if maybe the brake booster is going out or if I’m over looking something. I’ve checked all vacuum lines and everything seems to be ok. TIA