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I've just been through something similar. You need to do some checks. First, is there fuel making it to the rail? You can crank the car for a few seconds, then check at the schrader valve on the rail pointing downward between #1 and #2 injectors. You should get a good spray. Putting a fuel pressure tester on it would be great too. You can also pull the return line off the fuel pressure regulator-- if you are reaching about 43 psi, you should see fuel bypassing and pumping out-- put some clear plastic line on it, and run it into a container when you crank the car.
Are your plugs getting wet? Do you see a consistent spark? Spark trumps fuel on these systems for safety. Check for injector activity using a 'noid light (some parts stores will loan them). If the injectors are cycling properly, chances are the ECU is OK.
In my case my car simply wouldn't start one morning. I tentatively diagnosed a failed main fuel pump based on listening to it running and measuring the amperage draw, which was very high (12A between the two pumps). I replaced the pump and filter, but still no start.
It turned out that the car had over-fueled and washed down the cylinder walls. I couldn't make it run, in spite of several weeks of evenings of working on it periodically. I had to resort to a tow to the shop. They pulled the plugs, put in oil, replaced the plugs with new ones and off it went. I had tried adding oil, but I could never get it to run longer than a second or two, in spite of trying starting fluid. The oil was contaminated with gas (1/2 a quart overfull due to gas dilution) so it had to be changed.
My advice would be to work on measurements and diagnostics rather than parts-- test the spark, fuel pressure and the injector function.
Good luck!
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Herb Goltz, Aurora, Ontario, Canada '92 945t 210K mi
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