Being an 87, makes me wonder, you may have lower impedance injectors on that engine, 87 they had both types, but your current chassis (88) is most likely High impedance. I'd check the secondary injectors on the upper intake, I believe if the tab on the connector is offset it's HI, and if it's centered it's LI. If you DO have LI and need to run HI, I have some. The current injector connects won't fit any LI injector, what I've done is just filed off the tabs if it comes to it. Prevents having to re-wire the harness connectors.
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LoginI'd want to make sure of this before I ever start it.