It could very well be a bad coil pack,or you have low compression in that cylinder.If the compression is good then go with the coil pack,if not you may need a head gasket or an intake manifold gasket.
This is a known dodge issue replce the injector!!!!! done deal
Is this a 4 or 6 cyl. engine? it is possible that the coil for #4 may have shorted open. the computer fires #1@4 together. i would test the injector ,or computer,possible vacuum leak,i would first see if there is injector pulse at the #4 injector and perform a fuel pressure drop test, to see if the injector is working.could be clogged.if this is ok i would swap out the sparkplug wire with a known good one. then swap the sparkplug #4 to #6 . if #4 is still missing, compression and leak test of that cyl.also does the engine miss? is this a miss that you feel?if not i would be looking at a computer program, or computer problem . i hope this helps
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