Try to diagnose the problem and fix it.
How do you know that it is your car?
It wont start
Your car wont start. lol
use jumpers
What have you welded ?
how does it stall if it wont start?
Don’t no
car wont start
catalytic converter?
Maybe Its The Muffler or the pistons hitting the engine
You may have overheated the engine or seized it.
lack of fuel