Hello to all. I hope you can help me out. I have a 2005 jeep grand Cherokee with a 3.7L v6. Friday I was driving it & the check engine light come on. I pulled over to check it out. I OBD2 tested it and it said that cyl. 4 has a miss fire. So I put new spark plugs (bosch) and coil packs (deralast) in it. The jeep started but was running very roughly and blowing white/blue smoke out of the tail pipe. What does a guy do now? I would normally go straight to the distributor but this model of engine does not have one. Can you help!