Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 99Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 99

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SERVICE MANUAL NUMBER 24
Troubleshooting with Vacuum Gauge
Reading Steady reading between 15-21 inches at idle rpm Extremely low reading, but steady at idle rpm Fluctuates between high and