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i'd say its just something to note if it happens again, there are a couple of issues that cause the light to flicker, but if it limits the engine as well and does not throw a code or having one pending, then more often than not its a problem with the cam switching, that itself has a couple of different problems, but again if no code its generally something mechanical with the cam itself, the lifters usually.
however i wouldn't worry too much, i'd just keep an eye on it and see if it happens again, or if you feel substantial power loss, there has been a few reports of phantom 6k limiters.
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