2005 645ci Cold Start misfire
A week or 2 ago my BMW would stutter when turning the engine on from a cold start. I took it to the dealer who saw 5 misfires P0304, all of these happened on cold start. (Especially in cold mornings.) They replaced #4 spark plug and ignition coil. The day of the work was great. The next morning there was a misfire. Misfire the day after that. The Check engine blinks for a few seconds and then just stays on. When the engine warms up, everything seems fine. The Engine light stays lit... but it's probably due to the misfire.
Any suggestions to narrow down the wide range of issues would be excellent.