Truck is an 05 4.7Liter Se edition Durango.
So it was a while back since I had pulled the code on my durango like back in November of 2017. From what I remember it was a generic code saying the my Number 3 Cylynder was missfiring.

My truck runs like its not firing on all cylinders, go figure!
My symptoms are Loss of Power. When going over 2500 RPM's the motor knocks stalls or misfires and there is a drop in power. Happens almost every time while accelerating from a stop or climbing an on ramp to the highway.
The truck will continue to gain speed if I feather the gas and keep the RPM's low. At higher RPM's I also notice that the truck in running rough as the steering wheel shakes quite a bit.

Things I have Tried. Replacing All Spark Plugs, Replacing Coil on number 3 cylinder.Checking for Spark on #3 plug. Replacing Injector on #3 cylinder. Pulling Valve Cover off on Driver side and making sure no Rocker Arms have fallen off.

Here is my questions:
Am I wrong about the position of #3 Cylinder? If I'm standing in front of the Durango. I'm on the Driver Side. The first cylinder would be the one closest to the bumper on driver side. then #2 would be closest to bumper on passenger side. Number 3 would be the next one in line on the Driver side. (Do I have this Wrong?) If I do, alot of the steps I have taken to fix the issue would be because I have my numbering wrong. In the past I have had issues with Cylnder 7 missfiring and it was the plug fowled once and the Coil Pack bad once. (That one was on the passenger side, second closest to the firewall.

Are there any other things that could give me a 103 missfire codes besides what I had mentioned?

Thanks for the help in this.

 

I figured out the Problem!
I'm posting the solution I ended up having so that maybe someday this post can help somebody else with the same issue.

Going over my original list:
Things I have Tried. Replacing All Spark Plugs, Replacing Coil on number 3 cylinder.Checking for Spark on #3 plug. Replacing Injector on #3 cylinder. Pulling Valve Cover off on Driver side and making sure no Rocker Arms have fallen off.
I realized that I left out something else I did when I replaced the original injector. I also replaced the dry and brittle connections for the injectors.
When I pulled the the injector, I was sure that it was bad because it was cracked and puffy. I wish I would have taken a picture to post here. The best comparison I can think of is when a capacitor goes bad it will puff.
After I got everything back together and installed a new injector, I continued to have the issue. I completely forgot I replaced the connector and guess what, having a bad connection at the injector produces the same trouble as having a bad injector!

I caught the issue by examining the replaced injector connection with one I did not replace and noticed that the wires were about 15mm or just over 1/2 inch longer than the rest.
That was was the issue! On closer inspection I could clearly see the metal pins did not make it all the way to the end of the connector!

Runs like a champ now, Now I just have to fix a ball joint and do a little rust repair and she will be good as new!

I hope this might help somebody with the same issue or give some possible ideas to what can cause the P0303 code or any code that may be P0301 through P0308