If anybody around the columbia sc area could help me test my ignition coils I would really appreciate it. Getting CEL codes of: p0304 & p1399 which is cyclinder 4 misfiring and random misfiring i believe. You can text me at 8034204249. I would love to get this checked before the end of this weekend so I can possibly avoid renting a car for work. Thanks.

 

Its possible its the injectors. mine did the same thing a year ago and it was the injectors. odd i know but that cured it. i waqs getting the same misfire codes. i even tried the coil swap to no avail it came back. good luck with your delima.

 

mine was the valves. when i research this for mine i saw a lot of injectors and valves as the culprits. good luck

 

First thing you should do is swap the #4 and #1 coil pack and clear the codes. If it comes back with a cyl #1 and random misfire after that you know it's the pack. Check the plugs for correct gap, and then start looking at injectors if that isn't the problem. The coil and the plugs are the #1 failure.

EDIT: check that the #4 plug isn't loose too.

 

^ That's what I did with mine. If you can wait until Saturday, I'll bring that extra coil pack with me on my way to Cola.