Hello all. I don't have much more hair to pull out so I beg your thoughts. I have a 2010 Dodge Ram 2500 with 5.7 Hemi. Got a misfire in #2 . Changed all plugs, changed coil and checked fuel injectors. I pulled out plugs in #2 and rechecked and they were black. A good friend of mine is a mechanic and he did some testing. 1st he did a compression test, all was good.Next he pulled all plug wires so engine would not start and put a tester on #2 plug wire. Then had me turn engine over. He said there is power (spark) going to coil for about 3 seconds and then stops. It appears there is spark then for a few seconds and then nothing. Any ideas? I am really stumped. Thanks in advance for your time!