Knock control, knock sensor voltage

Ovid

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Ok so when i go to mvb 026 i get the readings
cyl 1= 1.029 cyl 2 = 0.981 cyl 3 = 0.982 cyl 4 = 0.427

Why is cyl 4 so much lower than all the others, the readings are at idle and when reving number 4 cylinder is always half of the others , any ideas ? im trying to figure out why the engine hunts a little on tickover.

Any help greatly appreciated.
 

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