make sure all the vacuum hoses are properly attatched and parts installed properly, i.e. IAC. the iac valve lets in a small amount of air to keep the idle steady. without it in place, or with it not functioning, you will have the roller-coaster idle. to pinpoint vacuum leaks, try using carb cleaner sprayed around suspect hoses to see if the idle changes.
did you do any recent mods that might have caused it?
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