Any help on finding out which coil is the faulty one

 

The front ones are easy enough to get to but the ones near the firewall take more time. Having to remove the upper intake runners/ runner just to access them. I’m changing all of them just for this reason I don’t want to keep buying gaskets. You can check them with a multimeter to find the one that is faulty, but your going to have to remove the upper intake manifold runners/ runner to access all of them. Autozone sells all six for a decent price. Google coil testing good luck