Toyota Repair: toyota corolla 1999, toyota corolla 1999, spark plug wires

Question
There was the "check motor" light. At the service station, among others, it was the spark plug problem. I removed the spark plug high voltage wires and, around the spark plug was oil. I replaced the spark plugs and everything was OK. After another 3000 miles, there is this behavior like "misfiring", slow take off, shaking and "check motor" light. If I press the pedal to the end, there are high revs, but not misfiring. Again, I found oil around two spark plugs, but cleaning didn't solve the problem. What could cause the misfiring? The spark plugs are Toyota original and only 3000 miles with them.
Thank you,
Nicholas

Answer
You should replace the spark plug wires because oil getting on the connectors at the spark plugs can cause them to leak to ground, at the same time the oil leak problem into the spark plug tubes needs to be addressed, to repair this oil leak the valve cover should be removed and the gasket and the four tube seals replaced.