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Use a gage and check proper fuel pressure. With tbi fuel injection, the fuel pressure is 9--13 psi. I have seen fuel injector spray pattern that looked good to me, but, the fuel pressure was half of what it should have been. 5 psi may show a good spray pattern, but, it won't start and run a v8. In my opinion.
Any applicable trouble codes? Your obd1, you should be able to check some codes yourself, if there are any.