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Q: how to get the rpm and timing right without accelerating the engine too much?? on 1990 Mazda B2200

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
put a ground wire from the green test connector.Set the rpm to 750 on idle and timing on 6. As soon I disconnect the ground wire,the engine accelerate and rpm goes over 800.The repair manual ask me to ground the test connector so i did.Just want to have my rpms right to smog check. Thanks.
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Im setting idle speed and making sure timing is correct.Thats what the underhood label says: idle speed 750rpm and timing on 6 degrees. Just dont understand what is that ground wire connector for ? why do i need to ground it ??
That is for setting the 'base' ignition timing only. Disconnect , then adjust idle. What else was done , leading to the need to make adjustments?