Does it have a minimum driveability mode? 1500 RPM's like cutting off engine

 

Welcome to the forum but need way more information...

 

If I understand your question right, there's a "limp" mode where the computer severely limits fuel that might give you what you're looking for. I believe it's when the computer can't sense either the EGT or boost pressure. It's probably possible to rig up a switch to turn it on/off, like when you go somewhere with valet parking. Somebody used to sell "valet switches" for the older 12 valve trucks that accomplished the same thing.

 

She must have got it fixed.........