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Check your map sensor.. It runs to your breather.... Unplug it or it's unplugged. That's one of the possible idle ups and downs.
I had that same problem.. Check your fuse also this year model. The wiring can be going bad.. Unscrew your back bulbs and checks wires.
I have a 1989 S-10 Blazer. I'm trying to hook up my radio but I'm not getting anything . There was a radio in there once b-4 working. When I tried to put a CD player in there it's not working. I have 2 CD players i attempted to put in and I get nothing.. What am I doing wrong?