What is the firing order?

Here's the drawing. List the exact fault code number if you need more help.

PO300 code which side is the driver side by the banks 1 or 2? What side is number 1 on?

I see your confusion. There's no arrow indicating the front of the vehicle. I found other drawings, some of which show it as a transverse engine, and others that show it a normal, "north / south" engine. It appears in the previous drawing, the front is on the left side. To add to the confusion, Chrysler always numbered the cylinders on the driver's side with odd numbers, but here they did the opposite. Sorry for making this confusing.

With a normal engine, bank 1 is always on the driver's side. I get confused when it's a transverse engine.

Code 300 is for a random cylinder misfire. That code can even set when you don't feel the misfire. Look for something all the cylinders have in common, such as low fuel pressure, low charging system voltage, blocked air filter, and things like that.

So, you are telling me that 135 is on the passenger sitting in the car?

So, you're telling me that number one plug is on the passenger side sitting in the car?

That's what I see in this diagram. As I said, that is the opposite of what Chrysler used since almost forever. Normally 1, 3, 5, and 7 were on the driver's side. This diagram took me by surprise. I looked at others and they all show the same thing.