If you have a CEL go to your local parts store, they can let you know the code for free. For a more detailed scan take it to your local dealership for probably 60 bucks they can give you a more detail scan. if you already got a scan disreguard this. I not sure there is a way to bench test the iac. With needing a vacuum and electrical supply. I have a newer iac if your interested. I put it on my car just a few weeks before the engine went. Let me know if you want it.
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Do one thing every day that scares you. -Eleanor Roosevelt