Something you replaced is likely the cause. Search for the problem by starting with the easy to check things and moving on to more difficult.
1. Spark plug brand/model correct?
2. Spark Plug Gaps correct? Also check condition (color/deposits) since it can indicate if just one cylinder is cause for the fuel dilution or all of them. If that checks out then...
3. Then I'd move on to suspect the ignition coil or one or more of the spark plug wires are faulty. Not sure how to check that but that's what I'd look into next.
I doubt any of the other things above would cause fuel dilution.
1. Spark plug brand/model correct?
2. Spark Plug Gaps correct? Also check condition (color/deposits) since it can indicate if just one cylinder is cause for the fuel dilution or all of them. If that checks out then...
3. Then I'd move on to suspect the ignition coil or one or more of the spark plug wires are faulty. Not sure how to check that but that's what I'd look into next.
I doubt any of the other things above would cause fuel dilution.