i think you may have posted your vin wrong, any way you can determine the year by the 10 digit. this includes using the WDB. see the chart below, it looks like yours may be a model year 1991 due to the M
J=1988
K=1989
L=1990
M=1991
N=1992
P=1993
R=1994
S=1995
T=1996
V=1997
W=1998
X=1999
Y=2000
1=2001
2=2002
3=2003
4=2004