OK, so now I've got a problem.
Suddenly, with no tinkering or new mods, the engine will not stay running at idle this morning. You can wing the throttle and she revs smoothly. You can drive away and not feel or hear anything amiss. When you stop it may idle at about 1200 rpm or it may die in or out of gear. If you restart, it dies over and over.
I have codes of P0171 and P0174 which are FUEL TRIM SYSTEM LEAN BANK ONE AND BANK TWO, respectively.
I have had a code P1441 for a long time. It shows EVAP SYSTEM FLOW DURING NON-PURGE. This re-codes in a few miles after clearing. I do not think the 1441 code is related to the current problem.
Last gas fill gave the usual 15.5 mpg.

Thanks for any ideas or advice? Yes, I am supercharged.