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Yes I agree back off the timing a bit till its smooth through the whole rpm range. If your TPS was messed up, I don't think you would be able to start the car, but I'm not sure. The ERG valve just is on there for emissions to recurculate hot exhaust to have a cleaner burn. And fuel filter should not have any effect on the knocking, but running crap gas (low octane) and being out of time a hair would cause a knocking issue. Man running an engine at over 7k, you might be picking up engine parts off the road dude, go easy on her!
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