Mazda 626 engine 2.0 stalls bad then dies after replaced timing belt. did it get valves dammaged maybe?

2012 really ? what country? we have no 626 year USA that year
or do you mean the Mazda 6"? 2.5 or 3.7L engine?
cut out means what, be more exact in what that means
ALL DC power and lamps and engine and radio die , on the fly.?
or just engine, all lamps good.
lost power means engine power or DC power or both.
engine stalls. are complex over 50 causes in engine or EFI.and more.
can the stall (stall means engine goes to 0rpm) but can you prevent the stall with a fast right foot?????
does the engine restart easy, at stall? or not.
is the starter motor always working(cranking), after the stall?
stalls may only happen on hot or cold engine or both.
bad spark is #1 cause of stalls. (and lots more ) try new spark plugs.>?
EGR stuck open
IAC stuck closed(idle valve gunked up)
battery died, or alternator dead or intermittent.(or going off line for battery gross shorts or opens)

mazda 6
Mazda since 2002, replacing the long-produced Capella/626.
and
The 626 replaced the 616/618 and RX-2 in 1979 and was sold through 2002, when the new Mazda6 took over as Mazda's large family car. 4,345,279 of the 626 and Ford Telstar models were sold worldwide.

post real car model names and real engine size first and even country the car was delivered to first or the VIN that tells me all that.

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1994 Mazda MPV timing belt replacement, 6 cylinder DOHC ...

? 3:46
https://www.youtube.com/watch?v=sD2G-NzycvU
Aug 11, 2011 - Uploaded by rsarp
1994 Mazda MPV timing belt replacement, 6 cylinder DOHC 3.0... engine so the valves would not be bent ...

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Where are the timing marks on a 1994 mazda 929 3.0l - Fixya

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Mazda Timing Belt Replacement

By you saying the engine "Dies" I am going to assume it restarts.
If the timing belt failed the engine would not start again until the belt was replaced.
So it could be a fuel or electrical problem.

The tension is spring loaded and you use a wrench or 1/2" drive ratchet end and move away from the direction of the belt tensioner tensions the belt..

FYI, did you know about this, sorry no specs, hope this could help. TMM MILPITAS CA USA Make: MAZDA Model: 626 Model Year: 1999 Manufacturer: MAZDA NORTH AMERICAN OPERATIONS Mfr's Report Date: MAY 09, 2000 NHTSA CAMPAIGN ID Number: 00V134000 NHTSA Action Number: N/A Component: ENGINE AND ENGINE COOLING:ENGINE   Summary: VEHICLE DESCRIPTION: PASSENGER VEHICLES. AN EXTERNAL SPRING IN THE TIMING BELT TENSIONER COULD BREAK. Consequence: THE BROKEN SPRING MAY GET CAUGHT IN THE TIMING BELT, RESULTING POSSIBLE ENGINE STALLING. Remedy: DEALERS WILL CHECK THE TENSIONER INSTALLED AND REPLACE IT IF THE VEHICLE IS EQUIPPED WITH THE AFFECTED TENSIONER. Notes: OWNER NOTIFICATION BEGAN SEPTEMBER 28, 2000. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT MAZDA AT 1-000-222-5500. ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).

If you are talking about the serpentine belt tensioner , not such a big deal as long as you don't over heat the engine due to no water pump. If you are talking about the timing belt tensioner , it could be big trouble. I am not familiar with your engine , but if it is an interference engine , serious damage would be done by the pistons hitting the valves. I will keep my fingers crossed that your car has a non-interference engine.

readjust belt

It is VERY IMPORTANT that you give this Priority Attention as FAILURE in this AREA Can cause CATISTROFIC ENGINE DAMAGE
Below is one Item I found Related to your Complaint.

An external spring in the timing belt tensioner could break.
The broken spring may get caught in the timing belt, resulting possible engine stalling.
Dealers will check the tensioner installed and replace it if the vehicle is equipped with the affected tensioner.
Owner notification began September 28, 2000. Owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact Mazda at 1-000-222-5500. Also contact the National Highway Traffic Safety Administration's Auto Safety Hotline at 1-888-DASH-2-DOT (1-888-327-4236).

Have you checked the fuel pressure? It sounds like a bad fuel pump.

Oh, great...just bought a '95 626 for my daughter and we're going thru the same problems. Was told to replace valve cover gasket and plugs and wires. replaced filters and put in new oil and fluids. Also read somewhere it could be alternator issues.