could be a few things.
-Check for vacumn leaks, i suggest that cause of the erratic idle.
-Check and clean the idle control motor, could be preventing correct idle.
-Base idle screw wound out too far, so throttle butterfly snaps shut, starving engine of air.
What sort of "GE" ???
4age
3sge
etc etc???
you should include some more info when you post. but check out the stuff i suggested above
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