on cold starts the car will stutter and sometimes throw a CEL and PSM failure.. scan tool says cylinder#2 misfire. already replaced plugs and coil.. has anyone else had this problem, if so..any solution... car no longer under warranty.

 

I had similar problem.
Cyl #:X (cant remember exact one, lets say it was CYL 1)

Code was CYL 1 Misfire.

First thing i did was replace all plugs (needed to do it anyway)

Went away for a day, then came back. Car was shuddering.

Still Cyl 1 misfire.
So i know it wasnt plugs, next was to try coils.
Instead of replacing all coils, i move the Cyl 1 coil to cyl 2 and vis versa.

The fault followed and now i had fault in Cyl 2.
Bingo, coil pack.

Fixed!

 

************* UPDATE**********
Replaced the spark plug and coil on cylinder #2... drives great now..