now it won't turn over

I have a 1991 manual transmission Pontiac Firebird with 3.1L V6 MPI engine. My dad
haven't use it in year so I decided to use it, I can get it to turn over but can't get it to
start. I took out the old gas and put in new gas, I check the spark plugs, replace the
battery then I try starting it but pink smoke started coming out from the computer and
one of fuel injectors started smoking so i replace both of them and it still won't start
then we try car diagnostic scanner but nothing pop up. the next day it won't turn over
now. the light that pop up are infl rest, service engine soon, security and when I try to
turn the key the brake light show up