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It's running lean. So lean that the ecu isn't able to keep it out of the operating range where it's knocking.

It may be related to the work previously done. Or it may be coincidental. See if the problem resolves when driving with the gas cap removed. That would be indicative of a clog in the tank venting system that causes suction. It could be as simple as a bad gas cap. It may possibly be related to an issue due to an improper repair on the purge valve. It could also be a defective valve.

If you can get it to act up with the cap on and you hear a hiss when unscrewing the cap, it's a vent. It could also be a fuel pump on the way out.

You may also have gotten bad or old gas at your last fill.

When is the last time your filter was serviced?
 
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