egr or timing backfire

air cleaner was off which is how I burnt off arm hair, eyelashes eyebrows, and some up top, which bothers me more than anything else, I am running short of it, and i was trying to get it to move under power, but when it backfires it blows its self out
Ok, follow the rest of the diagnosis procedure and you can either confirm or eliminate. OR you can just keep working blindly.