I don't think it would be the spark plugs because I changed all of the spark plugs to the same kind and only codes pop up for 4 cylinders

 

Still and all...... the rare earth plugs are REALLY hit and miss on these trucks. Some folks have no issues with them, unfortunately, a fair few do indeed have issues. It's a cheap/easy experiment to see if it IS the problem, by simply changing out the plugs. You may be surprised.

 

Here's what one pro says:
"First, if you’re getting a P0300 Random/Multiple Cylinder Misfire Detected code, that would indicate a universal problem that applies to all cylinders. In that case, start by checking fuel supply issues like poor fuel pressure caused by a bad pump, restricted fuel filter, or a defective fuel pressure regulator. If all those check out, look for a major vacuum leak or EGR valve leak. EGR is recalculating exhaust gas back into the intake manifold. If it isn’t operating properly and letting too much exhaust in, it will lean out the air fuel mixture to all cylinders. So check those things first. If you’re still seeing multiple misfire codes, it’s time to examine the timing chain or belt to see if the valve train is out of time with the crankshaft. That would cause poor valve sealing. Of course, in an abused engine, or one with a ton of miles, there’s always the possibility of poor cylinder compression or leaking valves. But that usually doesn’t cause misfires on all cylinders. So let’s take a look at individual cylinder misfire codes..."
http://ricksfreeautorepairadvice.com...0-p0311-p0312/

 

Check plug wires one at a time for resistance. If the wires are under 8mm also keep space between them. If you have stock coil use stock wires and plugs. Aftermarket coil use 8.5mm or better wires high end cap and rotor. That will let you use plat.plugs with a larger gap. Also the camshaft sensor gets old at 150k mi and some fail. Also check timing chain. When they get sloppy a bit thay magnify other primary ign. problems.