What is your question?
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What is your question?
The engine does not idle smooth, it flucuates in RPM up and down when idling. Steady! Service engine light is on.

2 Replies
the mass air flow is in the intake hose between the air filter and the throttle body opening. it controls fuel management according to conditions. i would look at vacuum leaks before throwing parts at it. get the code pulled and get back to us. Roy
i will check for vacuum leaks first. thankyou