5.0 supercharged 2012 xfr. Timing job was recently done and after that it’s been lean bank 1 code(only bank 1 not bank 2). Smoke tested it can’t find any leaks. What can I do next. Some symptoms rough idle, fluttering/bubbling noise from exhaust sometimes when i let of the gas(different from usual backfire at higher Revs), sometimes when I start the car doesn’t matter cold or warm the revs will climb steadily to 2500 stay there for about two seconds and come down to normal.

 

Was the injectors seals replaced when reinstall