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Black soot on intake port 2

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I have a 1986 HCI esprit. I was doing some routine work, which involved removing the red plenum box. When I checked the intake ports where the throttle flaps are, I noticed black soot around intake number 2. The others had really clean aluminum. When I opened the throttle, I could see it inside as well.

Is this from backfiring through the intake? What causes it, and should I be concerned? Keep in mind that this is a fuel injected car.

I rebuilt the engine a year ago. Everything should be okay. I had some backfiring because of a faulty throttle position sensor, but that was fixed.


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