Follow up to Nick; I fixed a leaky camshaft seal and o-ring as well as replaced inner/outer control arm ball joints and bushings totally unrelated to my oil leak but it had to be done. I don't get an RPM dip in reverse anymore and the engine vibration is not as noticeable. Can't say I can explain it. Haven't driven the car enough to see if the symptoms return.

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This post was auto-generated based upon a question asked on our tech article page here:

A change in vibration may have affected the knock sensor changing the ignition curve

- Nick