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I had similar problem w a 2.8 I converted to MFI.
Try double checking your MFI phasing.
I did this by removing #1 spark plug so I could hear the sucking sound during the intake cycle. You could also just take out all plugs except #1 to know the compression cycle.
Then loosen the injection fitting to #1 on top of the MFI pump. This will allow you to see fuel seepage when the injector is triggered.
Then turn the motor by hand...
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