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80% of the time if you hear the knock then it's whiplash from a valve and would require a replacement. Some times if you hear a knock it's from some real bad gas from being old or watered down.

I would toss in some injector cleaner or some octane booster and reset the PCM.

I buy 89 octane and once a month toss in STP octane booster and once every six months toss in some B12 chem tool or seafoam into the tank.
 
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