If you have just one piston misfire it can be the spark plug or lead- dispack, as long as there is no oil residue in the water or water in the oil, i would say the other 3 more like to be thew dispack.
SOURCE: 2004 KiA SORRENTO engine light on - misfire #5 cylinder
if it is a misfire, then that means it is probably the plug or the wire, change those first, if not then yes check the injector.
SOURCE: missfire on #4 cylinder for 1998 kia sportage
had the same problem....broken spark plug. try replacing your plugs.
SOURCE: cylinder number 5 misfire, what
I'm assuming the code that was pulled is P0305. Best case would be a bad spark plug on the number 5 cylinder. Keep in mind, the spark plugs are torque sensitive when installing. These are the possible causes that are stated in a Jeep service manual for your vehicle. Check the basics first......Camshaft,crankshaft,valve timing or vacuum problem,ignition coil output is low,engine internal mechanical problem,secondary ignition pattern is irregular, fuel contamination, Fuel pressure leak down is out of spec, fuel pump ampere out of spec, fuel pump capacity out of spec, fuel pressure is out of spec., engine compression, PVC system restriction, Fuel injector #5 is defective or the connection on the injector itself is loose or corroded, Intake gasket defective. It could also be freeze frame data in the PCM, but this is a very very rare cause.
SOURCE: gmc envoy with misfire in number 1 cylinder
You could have a bad spark plug or a bad coil pack for cylinder 1. Or it could be as simple as a poor connection at the coil pack.
Other possibilities are, bad injector or poor compression.
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I did put valve stimseal the problem now misfiring on number 2 cylinder and is smoking
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