i have a 96 dodge 1500 with 5.9 i had code po300 and po301-308 changed all spark plugs and wires still skipping

 

Check the crank shaft position sensor, when they start going bad they can cause a miss fire. If its the original sensor with lots of miles on it, it would be a good idea to replace it.

 

Have a look at your plug wires, dist cap, and rotor as well.

 

i did the dist and roter button still all 8 misfire.. i just bought the truck it has 196000 miles on it .Where is that crank shaft position sensor located?

 

Its on the right side of the engine by the exhaust manifold, sticking through the back of the engine toward the flywheel.

 

Pain in the keester to see it, let alone change it.....

Unplug your front O2 sensor, and see if the misfire goes away.

 

I'd +1 on this... I had a random misfire issue that start at ~150k... nothing major, just the occasional annoyance... it became more prevalent, and I finally changed it at ~175k... bingo, problem solved.

Any sensor with more than 100k on it should be changed, in my book.