bad engine? Code P0300 random multiple misfire?

We should start with a compression test, or you can send me a video of the engine cranking over so I can tell if the engine is in good shape or not.

This guide can help:

https://www.2carpros.com/articles/how-to-test-engine-compression

If the compression is good and the engine has fresh spark plugs etc., I would do a fuel filter because they can clog up limiting the amount of fuel getting to the engine.

Here is a video of the job being done and instructions in the images below for your car:

https://youtu.be/cMa2bp4jbNU

Clear the codes after the job is done. Check out the diagrams (below). Please let us know what happens.

So sorry sir, but I put a new fuel filter on it too, I just failed to put it in the list.

It sounds like the fuel pump is starting to go out. To be sure this guide can help you check the fuel pressure. I have also included how to change the pump out just in case in the images below.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Key On Engine Off .................... 55-62 psi

Check out the diagrams (below). Please let us know what happens.

I have 55-62. My mechanic suggested a distributor. I have one coming. 268,000 miles.

Yep, a worn distributor can help, let me know what happens.