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Re: up and down
There are several items that you need to check. First check for vacuum leaks. If you have a cracked or damaged vacuum line then it will cause wandering idle and the CEL to come on. If you don't find any vacuum leaks, check and clean the idle air control motor. Next check the mass airflow sensor and clean it with some electronics cleaner. Allow both to dry completely before you reinstall and don't touch the pintle on the iac or the inside of the mass airflow sensor.
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