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That makes it a Vortec an a little harder to check injecter pulse. Normall you can just plug a noid light into the injecter plug but yours is under the manifold. It can be done by tapping into the wires and jumping them to a noid light. You would use the Pnk/BL and the DkBL wires.
Here's what the noid lights anspark testers look like.