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Yeah, TBI systems were incredibly cheaply designed and not very good... at least not much of a step up from a Q-jet. It was basically a carburetor by design, one big, central injector, and I know there was some semblance of computer control over it, but not very much.
It was alpha-N, which in my opinion isn't really a step up from a carb, actually a step down since it's spraying fuel based on fuel position and RPM, so it isn't sucking the fuel that it needs like in a properly jetted carb, it's just getting fuel thrown in regardless of load. The FI used in American cars was super primitive, and the kits to swap back to a carb were, aside from an emissions standpoint, with a good carb and good jetting actually an upgrade in fueling.
This is one of those things where if it is in fact a Delphi injection, there will be a workaround to be able to tune it.
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