2013 Sierra SLE engine quirk

BarryKH · September 13, 2023

2013 GMC Sierra SLE with 5.3 LC9. AFM programmed out. Sometimes when stopped at traffic light, or if left idling for a minute or two, when putting in drive it stumble and dies if you give it gas. If you let it idle in drive, it will take gas and go. Only happens at times when idling for a few minutes, then trying to take off. Besides that, runs great rest of the time. Bugs me that I can't figure it out. Anyone else had this issue?

CamGTP · September 13, 2023

Did you clean the throttle body yet?

BarryKH · October 30, 2023

I have cleaned the throttle body thoroughly, put a new cannister purge valve on, new fuel cap, ran full diagnostics with scan tool, no issues showing up.

BarryKH · November 19, 2023

I think I have finally fixed the quirky engine. I recently purchased an Xtool D7 Scan Tool. I did an idle relearn and reset the fuel/air ratios. Since doing this I have not had an incident that I called Quirks. Been a month to 6 weeks since I did it, refilled gas two or three times and no problem with starting after filling. I was grasping at straws, but couldn't stand to give up and let it go. It may not be fixed, but so far it seems to be.