its funny you said that about the fuel cleaner. I also have the same problem!!!!!!!!!!!!! filled her up and putt gumout flue injector cleaner in then on way home from 2 hours trip light came on. she idles rough on start and cylinder 5 misfire. also have a wrong engine oil code pop up which is weird cause im using 5w 20 synthetic mobil on and this is the second time i used it and now it shows up????? have a 06 ram 5.7 mds hemi.... HELP!!!!!!!!!!!!!!!!

 

i too think I loosen some gunk and clogged a injector is that possible. Also notice a bit of smoke out exhaust only for 10 to 20 second when i start it. popped oil cap and no smoke comes out??? so thats not a head gasket issue right?????????

 

A bit of smoke when you first fire it up on cold mornings is pretty normal, and nothing to worry about.

It's possible you clogged an injector, but, you can just pull the rail, and inspect the injectors. They have screens on top to prevent just such an occurrence.