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Hello was the check engine light on that prompted you to replace the iac valve? No vacuum leaks?
Was the code a P1506 or what code did you have?
Ok the most common problem that causes codes in this series is a collapsed pcv valve hose or the pcv valve itself is bad. Inspect thehose for being collapsed or sucking in air and replacing the pcv valve and hose if needed. clear the codes and recheck,