Will not start

I guess it is time to do the testing and stop throwing parts at it.

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can only be tested during the failure. Any other time and they will simply test good because the problem is not present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That is what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the positive terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.

That simply cannot be true. If it passed every single one of those tests, the car would be running.

I would remove the spark plugs and look at them to see if they are fouled or not, then when it doesn't start there must be a reason much like Wrenchtech says, so one of the systems is letting you down lets find out which one it is so we can go from there, here is a guide that will help you.

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

Let us know what you find.

Best, Ken

The main relay has always been a problem on these cars. It is located behind the sound proof panel on passenger side (underneath glove box). The main relay turns on the computer and energizes the fuel pump. Check it next time it wont start. Open up the main relay by removing t he cover. When you turn the switch on, you should see both contacts close. When it wont start and one of the contacts fails to close, gently close the contact. If it starts up replace the main relay. Hope this helps.

Added a picture.