chrisoreeves

I have a 2011 SEL with the 3.5. It needed ignition coils because it would start misfiring at hard acceleration. So I replaced them all.

Now its running really rough, misfiring at idle and dying, terrible acceleration and a popping or sputtering noise when accelerating at highway speeds. 

When it first did it, I got codes:

p0420

p0430

p0300

p0306

p0302

I checked it again this morning and I am only getting the p0300, p0302 and p0306 codes.

Does anyone have any suggestions? It has 225,000 (highway) miles on it so I am sure things will start to go bad on it. 

The coils I used were high quality, but not oem. Also, my brakes are bad and need to be bled. I'm only mentioning this because I saw a similar thread here and they asked about brakes. 

Thanks in advance for any help. 

I have a 2011 SEL 3.5 that’s getting ready to turn over 200,000 (highway) miles. I am a musician in Texas, and drive all over the state for gigs. 30,000 miles a year.

Now that the “Beast” is getting up there in the miles, should I think about having the water pump changed as a precaution? I know highway miles aren’t as hard as average driving so maybe the pump has life left? I drive somewhere almost every evening and I’m driving back home at night. I just want to minimize risk. I do have roadside assistance also. Thanks for your input in advance 

Also, if anyone has advice on things to change/maintain at the 200,000 mile mark, that would be cool. It has new spark plugs, ignition coils, radiator and fan, alternator.