b18b1 problem

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I have a 1996 b18b1 in my 91 integra rs and it idles stupid like if it had a bad aicv but i already changed the valve three times and still does the same thing. It idles at 2k goes down to 1k and back and forth. i'm running a b18a1 TB and no fit valve. could that be a problem?
 
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