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this answer is out of the haynes code book. code 35 idle air control valve or cicuit. Or idle speed control switch or circuit(shorted). good luck
One tip on the Idle Air system on GM's - some need to have a special reset on that part to clear the code. On the 1980-1990's GM's the procedure was to drive the car at a speed exceeding 50 mph for a minimum of five minutes, continuous. You will need to make sure the car stays above 50 for the full five minutes. Make sure to find a nice stretch of open highway where the legal speed will let you do this. This will cause the computer to push the idle air system wide open, then fully closed, to check it over the whole range. After this you can clear the codes and the code should not come back.
If it does, cleaning of the intake may help, since dirt in the passages can affect this system also.
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