Maybe Its The Muffler or the pistons hitting the engine
The car rattles when I go fast in 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?
A rattle, or rattles.
car wont start
Don’t no
catalytic converter?
You may have overheated the engine or seized it.