Cylinder four misfire

Hi,

If compression is good, the plug is new, you have a new coil on it and it's working and a new fuel injector, the next thing I would be checking is fuel pressure. Too high or too low can be a cause.

Now, if you could provide a bit of info, it would help me. First, do you have the compression readings from all cylinders? Next, is it only a P0304 code you are getting? Next, do you lave a live data scanner? If you do, can you provide the short and long term fuel trims? Last, have you checked for an engine vacuum leak?

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Let me know as much as you can. I will watch for your reply.

Joe