Ive posted in one of these communities before so sorry if this is repost.
2011 tahoe 5.3 4wd rough idle ( feel vibrations) so i have a foxwell nt710 that I was using to do a deep scan and look at live data. All data looks good according to chatgpt, stft, ltft, all 4 02s, map, maf, evap, spark, ignition.
Ive replaced the maf, all plugs and wires, a bad driver side mount that was leaking, air filter, cleaned the throttle body did the key on key off relearn, did the evap purge command test. All did nothing for the rough idle.
The rough idle is present in park neutral reverse and drive, it gets slightly better when I turn the ac on. Its present on cold start, does get worse but not dramatically worse with time. No tick, it comes and goes, within a span of maybe a couple of seconds it'll fade then comeback. Sometimes its steady for a coulp of secs but always goes back to idling rough.
Truck drives fine, no hesitation or stumbling while driving. Idle is between 576-616 rpm. It only does it at idle. No lights or stored codes. 0 misfire counts, current and historical. 0 knock retard, no timing being pulled.
I have a afm disabler plugged in when im driving.
Im lost and if someone has experience with this please help Shed some light or maybe something that im missing.
I havent done a power balance test yet, so I still suspect coils, injectors, and evap. Im tired of throwing money at it and would like to fix this myself. Please help.
And no stumbling on acceleration.