How can I tell if I have my ignition coil harness plugged into the right cylinders? I just want to make sure that I don't have it flipped backwards. Other than starting it up and seeing if it backfires lol

 

They are in sequence on the harness........unless the loom is screwed up than its pretty self explanatory. They are spread out every 3 inches or so. Just plug them in to their corresponding location relative to the harness. Did you remove the loom from the hard plastic tray they are in?

 

If you want to get technical about it, a wiring diagram would tell you by wire color what connector goes to which coil....