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After you warm the motor and rev it you should turn it off, disconnect the TPS, and restart. Rev over 3000 RPM's 3 times, check idle, adjust, and check timing from there. Do not rev or do anything else adjust your timing to 10 degrees at this point and don't worry about anything else.
Vacuum (barring any leaks) can be affected by idle so a higher idle will provide more vacuum.
Vacuum (barring any leaks) can be affected by idle so a higher idle will provide more vacuum.