Shaking and lacking engine power?

Hello,

It sounds like you have a leaky spark plug tube seal. It is part of the valve cover gasket. The leaky seal will get oil on the plug and that can make the wire come off.

This will require you to remove the valve cover and replace the tube seals and the gasket.

Here is a helpful guide of valve cover gasket replacement:

https://www.2carpros.com/articles/replace-valve-cover-gasket

It is also recommended to change the plug that is covered with oil and possibly the plug wire.

Look at the diagram below for reference.

Please let me know of any questions.
Thank you.