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Okay, lets start with the oil you found on spark plugs when you were replacing them. this oil is coming from the valve cover tube hole area, notice the plugs go into the holes in the valve cover, there is a gasket the goes around the top of the tubes and when it leaks it goes into spark plug hole, the valve cover needs replacing . this will cause rough idle and running problems, after replacing valve cover gasket the holes must be cleaned, using crab cleaner, spray into holes and use air to blow out . this may need to be done a few times to get oil out . after oil is removed . then remove spark plugs and wipe them clean. The next step is to find the air (vacuum leak) , you said you hear it around intake tube. check for cracks or broken vacuum line. this leak will cause idle problems and driving problems,
often times the connection inside the plug boot gets corroded and it's almost impossible to remove the wires with out damage. when this happens I gennerally replace the wires anyway this saves you problems in the long run . the sparkplug wire removalk pliers are a good investment however they are only as good if the boots themselves are not siezed up on the plugs. I have had this happen alot over the 20 years i been working on vehicles. I usually just twist and pull on the boots till they come off and not worry about damaging them because they should get replaced anyway the new plug wires have a antiseize lubricant to keep from this happening in the future
Wrong model designation ali. It's either a c230 or a c280. The 4 cyl 230 spark plugs are located under the red cover on top of the engine. The plugs are down the center of the valve cover under this cover. The coils are on top of the plugs. Remove the cover, coils, and then the plugs. If it's a 280 v6 you have 2 plugs in each cyl. The arangement there is more conventional. The coils are bolter to the valve covers and have short wires to the plugs that are on the side of the motor just below the valve covers. Be careful removing the metal plug connectors. They will pull apart if you try and pull them loose by grabbing the wire. You need plug removal type pliers. Twist the metal end and pull like a mad man, repeat 11 more times! Good luck!
The metal tube stays in the heads. They make a special pair of pliers to remove the spark plug boots from the spark plug. You should replace the wires at the same time as the plugs on those models anyway though.