2014 Silverado shudder at low speeds

[Gordon1112]

My 2014 Silverado while going slow has a bit of a shudder but does not do it in manual shift mode and I also had the transmission rebuilt 21000 miles ago. Any idea what could be wrong? Thanks

[ic3man5]

Manual Shift mode usually disables AFM (V4 mode) if not in 6th gear. If that is your difference do a basic tune-up and then check engine mounts. There are TSBs out there to shim the mounts and updated engine mount parts to help fix this issue also.

 

Vacuum leaks have caused negative fuel trims (STFT and LTFT) and shutters for me at low RPM and high load.

Edited June 12, 2021 by ic3man5