Well, you can test the AFM to a degree as detailed in the TSRM. As for the TPS you should. Test the voltage at the VTA pin at the ECU. You should see around.5v up to about 4.8v as it the throttle is open and closed. It might be 3.8v on the high side, I can't recall at the moment.
Are you certain you don't have a knock?
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