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Spark Knock?
Sounds like spark knock(from too low of octane rating) I used to get this in my Nova (13 to 1 compression) FA 20 is 12.5 to 1 compression and could happen if the temp is too high. Cooling and higher octane solved it in my Nova. Try adding some octane booster and see if it stops it. Octane booster is pretty cheap so one try and you will know.
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