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I guess the knock sensor could cause this,anything is possible, but I have never seen a knock sensor do anything like this. The first step is it get your vehicle hooked up to a Subaru scan tool, and get the engine light fixed.

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Q: Your 94 wrx wont boost or rev past 4500 rpm th odd time when its cold it will boost and it runs greatthe engine warning lights on its also runnin the high octain fuelcan the knock sensor cause this?
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