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does the system maintain that 32psi when you turn the fuel pump off?
If it drops immediately back down towards zero, that pressure is leaking off somewhere.
How old is the line from the manifold to the MAP? If you don't know, then it's too old. It needs to be a strong enough line to not collapse and the ends should be clamped.
You can use a duty cycle meter on the injectors to see what % of time they stay open, though I've long forgotten what range you should be looking for.
-CTH
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