wonder what sort of EFI Isuzu used on the 2.8/3.1. I've got a '92 Izuzu pickup with a GM 3.1. The EFI is nothing familiar. Has a Mitzubishi logo on it. I think the processor is a Mitsubishi MELPS 7700 (a microcontroller derivative of the 6502). The ROM is unrecognizable, even after an extensive web search.