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Hmm.. Maybe it just needs to relearn. Let it idle for a while. There is also an option for learned knock. Maybe that got wiped out and it needs to relearn the info.
This was off boost. I undid the battery did my work on it started it back up and went lot run errands. Later it didn't go past 13, with the Cobb is this actually 18 counts of knock or is it like one count for every 7 or something?