Hesistation on acceleration and oil on the plugs leads my educated guess to be that the intake valves are in need of some adjustment...
The reason for this is because of the oil on the plugs usually leads to valves and the slow acceleration leads to too much air coming in so they are probabaly not closing properly or the seats are worn...
the bad news is that even though it is less likely it could also be the compression rings...I hate to mention that because that is a complete rebuild scenario.
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