Advance the idle

[Bricksack]

My idle sits around 5-600 rpm at that rpm my voltage drops some when i push the gas to raise rpms to around 7-800 it runs fine and voltage is perfect lights bright . Tested alternator ita good. Battery is brand new. There is no set screw to turn it up. Any one know how

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[firefighter_2319]

i really dont think you can, the timing and all adjustments are all set by the computer automatically. take that back, on the tbi i believe you can but GM has the screws capped off i think near the base, you will have to take of the tbi to gain access to them. if im wrong someone please correct me