code 51/ quits when returning to idle

[professorbob]

Thanks Cre for the rapid response. As you can gather, these issues have been ongoing for over 6 months.... See previous post for updates... I actually replaced the AFM module with a used unit, because I too had no clue that cleaning the module would kill it.
Thought originally that that is why the car started these issues after 120 miles, because the new replacement was used, borrowed a functional unit to determine if that is the issue. Very little improvement. Do you know of anyone I may send my unit too for a proper diagnositic of the modules.

This most recent problem with the blow gasket is what makes me believe there is a restriction in the converter. Just do not know how much restriction is required to cause the gasket to blow.
Is there an effective way to determine it the turbo is operating properly. I understand that it lays out unless the vehicle is driven.
My turbo needle is below 0 on the boost gauge.


The gasket arrive just now and I will be jacking the vehicle to remove the header for reinstallation.