Tony, I did. I'm sorry, I read the last one yesterday and assumed that was everything.
The codes you have (111 indicate everything passes), 628 excessive converter clutch slip, 634 is specific to the MLP (manual lever position) switch. It is on the side of the transmission and changes resistance signals to the PCM based on gear selection. The code is specific to a variation in signal resistance when in park, so I don't think that is the cause. Pic 1 below provides the diagnostics and possible adjustments.
The excessive clutch slip has a list of diagnostics. However, I don't see how that is causing a rough idle.
Regardless, starting with pic 2 are the diagnostics related to the 628 code. Here is the issue. The steps have you check something and based on the results; it takes you to a different test. I was able to get you through the first two because I know what you have already told me. However, after that, I need to know the results of test 2 so I take you to the next correct test.
Take a look and let me know your thoughts.
I do have one other question. The roughness you feel with the engine, does it seem like a misfire or just like a simple continuous rough idle?
Let me know.
Joe
See pics below
PS: Since you are unable to find anything related to the engine that may be causing the issue, what are your thoughts on a possible compression issue or plugged catalytic converter?
Images (Click to make bigger)
Friday, February 25th, 2022 AT 6:08 PM