How to adjust vaccum advance

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jacobdavis1979

G-Body Guru
Feb 18, 2011
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Like the title says im not real sure how to do this.
I know there is an screw inside the canister but which way do i turn it i dont wanna blow my motor. With advance hooked up the motor surges at 1500 - 2500rpm but unplug it and it runs smooth as glass. Im at alittle over 16 btdc dont ask me to pull timing out of it i already tried it doesnt help.
Do i just adjust untill the surgeing goes away if so which way do i turn the screw?
 
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