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That's normal. Are you putting pressure gauge on the fuel rail when it won't start to see if the pump is building enough pressure? Instructions for testing in the How-to guides here on ROJ.

Now I remember two different inline fuses under the drivers dash on the 89 we worked on, but I don't know specifically what they were for. We swapped the entire dash with my parts car and lots of things were then right in the open. I have not done anything like that on my 90, so I do not know either

No flash indicates an issue because a good ebcm will flash "12" if all is good.

This is from a post on the other forum that might be helpful. I think it's what I based the How-to guide on that show the location of the EBCM fuse.

I think you are correct about one for the ABS being above the relays on the firewall (#11 in the photo). According to the '89 FSM there is also one that powers the EBCM in a location that appears to be under the dash (#10 in the photo) and was also reported in the forums years ago. 1990 models might be different. I can't confirm the location of the fuse for the EBCM because I have never laid eyes on it. Just passing on information.

I believe you are correct.

Maybe I am in left field but isn’t the ABS fuse above the relays on the firewall in the engine bay, or is there another one?

I've used Kroil for years as a machinist with good success. It was provided by my employer so cost wasn't a consideration. Trans fluid and acetone is good, but acetone is highly flammable in enclosed spaces.

I have used the ATF/acetone mix on and off for years, and it does work well. Relatively inexpensive and a good way to use up those odd bottles of ATF from a vehicle you no longer have. I suspect power steering fluid would work as well but have never tried that.