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How much oil is in the spark plug wells ?
My saturn once had some spilled in there. Drove me crazy figuring out why it was running poorly.
Long screwdriver and a paper towel got it out.
Other hand,
My buddy was having O2 sensor issues with an older Izuzu he bought. Some metering showed voltage between the ground wire and the frame. We ran a wire from the sensor ground to the block and it started purrin like a kitten. Running one can't hurt. Often the ground strap gets oily on the back/bottom of the engine and makes lousy contact.
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