TTT.
I also found what I believe is a new in box
GM MAP sensor #16137039. Sure looks brand new, very clean. $5 no warranty.
Applications as per RockAuto
BUICK (1982 - 2004)
CADILLAC (1983 - 1996)
CHEVROLET (1982 - 2004)
GEO (1990 - 1993)
GMC (1984 - 1998)
ISUZU (1987 - 1997)
OLDSMOBILE (1982 - 2004)
PONTIAC (1982 - 2004)