Hi guys.
I am no good with cars but need to fix mine on a budget.
its a 93 eb wagon.
as i take off I loose all power (or stall when cold)

I have been looking online and the only things I can find are
O2 sensor (replaced from the werkers) a little better
map sensor (replaced from the werkers) a little better again
fuel pump need to replace if It could be the reason
Or I had the motor replaced from the 4l to a 3.9 but i dont think the injector or ecu where changed could It be them??please pease help

if fuel pump is stuffed it will need replacing.
maybe timings out?

pump wines when low on fuel 1/4 tank it starts.
coil and dizz just repalced by mechanic so I dont think it would be that. but how do i test??