Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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The most common problem for this issue is the fuel pressure regulator. If is mounted to the metering body under the upper intake plenum. What happens is the diaphragm inside breaks and instead of the intake pulling vacuum on the regulator, it sucks the fuel out of the metering body under the intake. Of course you would need to test it to verify this is the problem but it is a very common issue on this engine.
Let me see if I have a diagram. One moment please...
Please see attached diagrams. One shows the regulator. On the diagram that shows the injectors, I put a red arrow that points to the regulator location.
You will use a vacuum pump and try to pull a vacuum on the vacuum port for the regulator. If it holds vacuum then it is working normally. If not, it is bad.