Originally Posted by Satan
I don't really know how our Galants store codes.... But, I'd make sure that the code is cleared for sure, before you swap things around. I actually disconnected my battery a couple of times during this troubleshooting. REMEMBER to have your code for your radio handy, if you still have the stock stereo.
Anyways clear the code, then when it re-appears, check it again. Just to make sure. If it's giving you the same code for the same cylinder, look to see what stayed the same after your swapping....
For instance, if you swapped coilpacks and boots, what about the cables that go to the other 2 plugs (off the side of the coilpacks)? If you still have the same code, for the same cylinder, it may be one of these cables (if you did not swap them around before).