A GM vehicle with high idle speed is being diagnosed. Technician A says if the IAC counts show a value of 0, a vacuum leak is a possible cause. Technician B says if the IAC counts show a value of 0, the PCM may not be able to control the IAC. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: C

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