i'm not sure how they cleaned the IACV. but the guy that's been working on it seems to think it's an electrical problem causing the car to overfuel itself, because the car also has trouble starting cold...and when it does it blows out thick black smoke. i don't know what that means. he said as far as he can tell the ECU's wired up correctly according to the diagrams. it's the biggest mystery in the world!