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Discussion Starter #1
I have a 2014 Silverado 5.3 with 105,000 miles. It started misfiring while pulling my camper. I have done several things so far and the misfire while towing is gone but I still have rough idle after it warms up and kind of sputters/hesitates at around 1500 rpms. It runs a lot better but that rough idle and sputter is really annoying. So far I have done the following:
New plugs, wires, all ignition coils
Cleaned throttle body
Changed all 4 O2 sensors
Replaced all belts - just as a pm
Any ideas?
 

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Discussion Starter #2
Also I forgot to mention there are no codes. Even when it first started misfiring, the check engine light would flash a few times and then go out. And by rough idle I mean it idles good, sputters 1 time, idles good, sputters. Sputters are 3-5 seconds apart.
 

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I would add a fuel system cleaner to the gas on the next fill up. Maybe try using different gas, maybe a higher octane gas.
 
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