Fuel injectors

What kind of shape is your battery and charging system in?
Sometimes a failing battery or alternator (diodes too) can cause issues with the PCM.
Also check and clean battery terminals and grounds along with the ground strap from the engine to body or battery.

Could have gotten a faulty injector or 2.
One thing I do is I'll unplug whatever injector while it's running and note any difference in rpms.
Another thing is I'll swap out a known working injector like #1 with #2 and see if anything changes.
If it stays the same on codes and the way it runs, then the problem is with the connection either at the injector and/or the circuit supplying it.
If the code changes to show #1 is bad and #2 is good, then the problem is likely with the injector. You can do this with the #3 as well.
I'm leaning towards a poor connection somewhere, i.e. a bad ground. This is where a volt/ohm meter comes in.
The P303 will likely clear up once you get the the other codes taken care of.

R.S.LOGAN said:

Good idea to check out with a noid light .

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Don't have one of those...yet, still doing it the old fashioned way.
May just have to get one. Bet it makes testing much faster.

kennethbryant903 said:

Left side no difference unplugging any injector. Rt side lots of difference

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Check your connectors. R.S.Logans' (#7) post above yours is a cheap easy way to do it.
You may have gotten a bad batch of injectors.

I would try a few of the old known working injectors. Also, make sure your coils and plugs are firing.