Phantom knock issue

[blackrosenova400]

Things Ive tried

Moved spark plug wires away from each other to verify there is no spark jumping, no differance.

Temp fix exhaust leak at downpipe, no differance.

Removed damper pulley and ran to find no differance.

Seems to occur only when slightly warm and warmer (dont know if its just the ecu ignoring it earlier) and when you blip the throttle past 18%, even in nuetral with no load. If you hold it steady past that it does not register any knock.