Starts, but stall immediately.

It sounds like you have a vacuum leak and clean out the idle air control valve and EGR valve and test the TPS sensor-also check the fuel pressure with a gauge if its within specs.

Here is a guide to help you

https://www.2carpros.com/articles/throttle-actuator-service

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

That is a good recommendation. The manifold absolute pressure sensor can cause the engine to die out. What raz mentioned will cover all the bases.

Let us know what you find.

When this happens, have you checked fuel pump pressure?

You will need to do a fuel pump pressure test to be sure, here is a guide that will help you and you can get the pressure gauge from the parts store for free.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please run this test and get back to us so we can continue helping you.

Best, Ken

Of course, the old addage, it is either fuel management, ignition managment or air delivery.

An overlooked issue is cylinder compression. It can be lost when timing chain/belts wear out and timing gets so far out it causes detonation and other internal damage issues. Test compression. The rule of thumb is the compression should be no lower than 100 PSI and the highest compression cylinder and the lowest compression cylider should be within 74% of each other.

Check fuel pressure. Even though you have a new pump, the pressure reulator could be bad.

Those are the most evident and easy, but it looks like you have done so much, I have a wlk through tutorial that helps rule out issues. Since this is process of elimination, I think reading through thiswill help to shorten the list of possibilites.

Here is the link to paste into your brawser;

https://www.2carpros.com/articles/car-cranks-but-wont-start

Look it through and tell me if it helps or is it is all things you have gone through.
I will get back with you ASAP when you respond.

If you didn't have that problem before you replaced the chain-you need to verify the valve timing could be 180deg out-even if you're getting fuel and spark

Fuel pressure regulator is blown and it is pumping fuel into the intake via the vacuum line. Replace the reg and let the gas dry up and it will run again

Those 6 male ends are the injectors. Use a small screwdriver to pop them up out of the intake manifold. Might not be a bad idea to replace all of the injector o'rings while it is apart (12, upper and lower), prevent possible fuel and or vacuum leaks. When reassembling injectors into intake, use a little lube like WD-40 to help them go into the manifold

My pleasure