Engine Misfire Due to Faulty Ignition Coil on Kia Sedona

Problem Description and Possible Solution

An engine misfire may develop due to a failed ignition coil. Our technicians tell us one coil is used for each cylinder. If one fails, often times another is not far behind. It may be worth considering replacing all the coils if a failure is encountered.

Problem Data
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Average mileage: 114,009 (68,995–160,000)
5 model years affected: 2002, 2003, 2004, 2005, more2006
41 people reported this problem
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Viewing 1 - 16 of 16 comments
THE VEHICAL WOULD DRIVE FINE AT TIMES AND THEN IT WOULD INTERMITTENTLY MISSFIRE OR SKIP. I COULD FEEL THE VEHICAL HESITATE JUST FOR ONE SECOND AND THEN IT WOULD DRIVE FINE AGAIN. THE PROBLEM WAS MORE NOTICABLE WHEN THE A.C. UNIT WAS TURNED ON.
P0350 code, replaced the coils but still getting the check engine light
i replaced the coils / wires / plugs im still having problems with starting. need help !!!!!
Vehicle would miss under load (air conditioning) and hot conditions - particularly noticable at stop lights. Idle was very rough at these times. Occasionally a rare miss at highway speeds.
Hesitates when starting, rough idle, loses power when accelerating on occasion.
Started with misfires while running the a/c and then started to really lose power when going up a hill or turning a corner and would feel much more of the misfiring. Check engine light came on eventually.
misfire #3 & #6 cylinders
I replaced two o2 sensors and then the spark plugs, wires and boots and now I am working on the coil packs my problem with my van is it won't stay running and when it does it puts like its not getting gas but as soon as I hit the gas pedal it moves fast...
All 3 ignition coils went bad.
Started having misfire problems thought I needed a tune-up and found out 2 of 3 ignition coils have gone bad.
Replaced plugs and wires 15000 miles ago. Misses when it shifts into 3rd for just a few seconds, then smooths out fine.
Running rough and feeling like it is going to cut out at times.
The 2004 Sedona with the 3.5l V6 has three coils. Two cylinders / spark plugs share a coil. A misfire could indicate spark plug, plug wire, coil, or timing issues (among other things). Since a coil is shared by two plugs / cylinders, both cylinders that share the coil should register on the scanner if the entire coil is bad. However, if only one is showing up, then it could be that only a portion of the coil is bad, or the wire connecting to the coil is bad. You can check by switching a coil from a cylinder that appears to be firing properly to see if this eliminates the "missing" issue. If one or multiple catalytic converters are bad, it could also run rough as a result. I have also found from other sources, that if the timing belt gets off, then it may run rough and even trigger a misfire code. Hope this helps someone.
Continued multiple missfire after changing the plugs and wires
I've replaced all 6 coil packs in the last 2 years and one failed again this week.
Very rough idle. OBD-II Code PO300. Not sure what is the exact problem; ignition coil failure or another component.

Will have service/repairs made.