99 Wrangler 4.0 Auto trans.
Running fine on the highway at 75 mph., then exited the highway and came to a stop. I noticed a rough idle, then check engine light came on. Scan showed cylinders 3&4 misfiring. I changed coil, plugs, plug wires, cap & rotor and nothing helped. You can pull the plug wires off of #3 & #4 while it is running and the rough idle does not change. And the sound of the motor does not change. Plugs are getting fire and cylinders are getting fuel. Injectors are fine.
Any ideas?