I have a 2011 F150 Platinum with 116k miles. I replaced the spark plugs with oem plugs due to a little bit of shuddering that everyone talks about. I still feel a little here and there particularly when I start the truck in the morning. Should I replace the coils too? I don't think any of them are bad but although a bit pricey it seems like I should do it now considering the miles on the truck.