1996 Toyota Corolla Q&A

1996 Toyota Corolla Question: please help idle out of control 900 to 1800 rpm

my dear old 96 corolla 1.6 4A-FE, has a idle problem, it ranges from 900rpm to 1800rpm. and driving it is less than smooth between throttle on and off. almost as though it has a air leak. but none have been found, a friend has check the idle control valve and it seems to be ok. any other idea's Kind regards Stu. -
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