Jennifer Ballance

Hi, I was looking for some suggestions. I have a 2016 Dodge Journey. I pulled into my driveway and it shut off on it's own. Now it starts up and then dies within a few seconds. I had it towed to a shop and they said the diagnostics show it is misfiring. They said they would have to start going down a list of possible problems and it was $130 an hour. I had it towed home. My next step is to town it 30 miles to the dealership and minimum $180 to diagnose. Any ideas what it may be that I can try fixing myself?