Ignition coils are very common to fail but will not set misfire codes unless it is severe enough. If you can get a good scanner where you could see MOD 6 data then this is how you check to see if you have a cylinder misfiring.
Go to MOD6 and go to Test Id $53 Next screen will have the component numbers. $00-$0A That would be cylinders 1-8 Click on each one, one at a time and record the recorded misfire counts. If you see one cylinder higher then the rest then swap that cylinder coil with one that shows no misfires. Reset the computer and road test again until it acts up a few times. Recheck your MOD6 data and if the counter jumped to the new cylinder you installed the coil too then your coil is defective.
You can also do that with spark plugs and fuel injectors. But I believe if you do have a slight miss especially under load, then I suspect you will find a bad coil using the information I gave you. Good luck to you and let us know how you do.
Tuesday, September 20th, 2016 AT 1:36 PM