The idle isn't adjustable. you might want to have the idle air control motor checked out. they are prone to sticking in the open position allowing more air into the intake
Idle is not adjustable. The computer takes care of any idle adjustments needed.
SOURCE: i have a 1994 gmc safari.It seems to have a smooth idle at times
Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!
SOURCE: 2001 gmc safari flashing service engine soon light
id check mas air flow sensor maybe 02 sensor might bet the mas sensor
SOURCE: Can I used parts from an older model GMC Safari
whats a safari GMC?? just shows you how much i know ---- never seen one but if it fits then your ok ,sorry but very rare machines here in spain ,now ask me about a renault or a peugeot
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