A misfire diagnostic trouble code (DTC) is stored for cylinder #4 (P0304) on a coil-on-plug EI system. Preliminary testing of components following manufacturer's recommended procedures are within acceptable ranges. Technician A says that water may have intruded into the recessed spark plug well in the cylinder head. Technician B says that the ignition extension tube should be inspected for carbon tracking. Who is correct?
A. A only
B. B only
C. both A and B
D. neither A nor B
Answer: A
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