2002 Tahoe 5.3 vortec anti theft problems

Vmyrhaug

2003 lb7sac45 35" 20x12 fjallasport flares
Mar 6, 2016
177
6
18
41
Norway
have this car in my workshop now
when it cold it start and dies after 3 sec.
code on anti theft.

is it possible too disconnect/disable vats/anti theft via efi live?

i do have efi live with license.
 

Vmyrhaug

2003 lb7sac45 35" 20x12 fjallasport flares
Mar 6, 2016
177
6
18
41
Norway
the car have one problem.
when it is below 7 degress celsius, it start and dies after 2-3 sek. leave key in ignition for 2min, until security lamp stop blinking and fire straight up.
when its above 8 degress celsius it fire straight up and runs.
car have only one key.
don't remember kode number, but anti teft system not communication.