I have a P0204 which seems to be fairly consistent, along with an occasional P0300. Looks like this is pointing to Injector #4. I haven't looked at the misfire PID (on my Edge CTS-2) yet, but I'd bet that it'll confirm what I am hearing/feeling. A little poking around on the web suggests that there may be a harness rub situation near the FICM to consider as well. Questions:
1. Exactly where is the FICM located? I read that a harness may be rubbing against something close by, possibly grounding out a line to the Injector.
2. Can I see this injector #4 from the wheel well without dropping the liner?
3. I've read previously that the pigtails used by the LBZ are a direct fit and a better option than the stock L5P pigtails. If so, does anyone have a part number?

After hearing of so many issues related to these pigtail harnesses from L5P owners, I'm betting initially that this may be my culprit rather than the injector itself. With 130K on her, it would appear that it's my turn in the barrel, so I'll try some contact cleaner to see if that buys me a few days of run time before being forced into a dealership for help. If I'm replacing one, I may as well buy and eventually replace all 8. Maybe I'll buy an injector as well. Looks like p/n 12698552 (advise if I'm mistaken).

Can anyone lend some advice on the location of the FICM, the LBZ pigtail part number and the access to the #4 injector harness?
Thanks!