Long time listener, first time caller here. I have a 2007 Jeep Commander, 5.7l V8 Hemi. 88,000 miles. Started getting a misfire on cylinder 4 code last week. Changed the plugs (with Champion 570 copper plugs), changed out the coil pack, replaced the fuel injector for that cylinder, changed the oil (5/20 synthetic) and then replaced the MDS solenoid. When the MDS solenoids were accessible- it appeared a rodent chewed some wires and shorted out the solenoid- fixed the wires. I am obviously out of warranty so this is a DIY work in progress. Engine is still missing, Check engine light still comes on, still getting a misfire code on cylinder 4. Could the ECM have been shorted out too and therefore continuing to shut down the 4th cylinder?? BTW- when the intake was off for the MDS Solenoid swap out, noticed that the cylinder was alot cleaner then the others ??? Any thoughts?