i cant figure it out. All 3 cylinders on the drivers side are misfiring. P0304, P0305, P0306, and P0316 are the codes its pulling. Changed spark plugs and wires. New coil pack. Tested and the cylinders are getting fire.

 

Dirty fuel injectors? Try a bottle of Techron in the gas.

 

Wonder if you have something going on with the injector harness? I would have tested that and fuel pressure to the rail before tossing money on a parts cannon job, but hey...

 

I have a 97 4.2 that is doing the same thing but without any codes. You can pull the spark plugs and starting with #4 they steadily get worse up to #6. I need to get out and pull the fuel rail and check the injectors and harness but have too much going on right now. Let us know if you find anything on yours!