Hyundai Repair: 2007 Hyundai Accent Ignition Coils, technical service bulletins, hyundai accent

Question
Within the last 90 days I replaced all 4 ignition coils on my 2007 Hyundai Accent along with spark plugs. Only cylinders 1 & 2 were defective. Today, the check engine light began flashing and the car was running rough. The same codes are coming up P0300, P0301 and P0302 (multiple misfires in cylinders 1 & 2). Apparently, I fixed the symptom - what could be the cause?  

Answer
Hi, Joe.  If this occurs primarily on cold starts (32 - 70 F), you should take the car to the dealer to have the engine control module (ECM) reprogrammed.  There are several technical service bulletins regarding cold start misfire that have to do with ECM programming issues.