Car is 2000 Corolla with 60k miles that sometimes has a low idle (sometimes) when driven for the first 15 minutes early morning. Especially when accessories turn on, the RPM drop suddenly to 600 and recovers to 623 then back to 650rpm. After 15 minutes, everything works fine (normal 650 rpm)…my guess is the IAC Valve/throttle body needs cleaning.
What exactly do I need to tell me mechanic? That both the IAC Valve and throttle body needs to be clean? Also, after “cleaning it using a spray”…should he wait till the “spray dissipates”? What happens if it goes inside the engine?