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97 Jeep TJ sputters

I recently purchased a 97 jeep TJ it runs good except just after you start it. When it has been sitting a while and you start it the engine idles for a bit then starts sputtering and sucking a lot of air. Then it idles back up and runs fine until you stop it and it sits again. I replaced the idle air control valve and it seemed to help a little bit but it still does it. Any ideas?