Car is a 2005 5AT TL
Starts rough sometimes, sometimes not. Is certainly misfiring. Pulled a code for misfire cylinder 5, so decided to change plugs in all cylinders.

Pulled out a Denso skj20dr-m11 in all 5 cylinders BUT cylinder 5, which had a Denso PK20TT plug. Plug looked almost new, if not brand new.

Replaced all cylinders with a NGK (6441) ZFR6FIX Iridium IX plugs.

Cylinder 5 misfire still there.
Replaced coilpack in cylinder 5, and again the code came back and there are still signs of a misfire.

Any suggestions from here?

 

valve adjustment would be my next guess along with replacing the injector for the port.

 

New plug, able to tighten down properly, another coil pack, and still dead cylinder, take a compression test.

 

how long have you had the car? sounds like it may have ejected the #5 plug previously? perhaps that caused some valve damage

 

Well, the code cleared itself but it still has trouble starting every once in a while and a perceived loss of power.

I've had the car since December and this problem just came up about 15 days ago.

How can I tell if I need a valve adjustment? I have to remove the head for that don't I?

 

If it's cleared, then you make be OK. Occasional start issues and "perceived" loss of power may be nothing or something. A leak down test would probably answer that question

No, just the intake manifold and valve covers. Eric The Car Guy has a good video on a J32 valve adjustment. Google it.