Technician A says that the exhaust system can be checked for restriction by using a vacuum gauge attached to manifold vacuum and operating the engine at idle speed. Technician B says the exhaust is restricted if the vacuum increases at 2000 RPM. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B
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