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and has a solution. 1990 LS400 all stock. A while back when I started it, it ran great for 5 to 10 minutes, then it just died, started right back up and would run good only holding the throttle and maintaining over 1800 rpms or so. Let is cool down and did the same thing for many other...

From a 1990 to a 1992? I'm talking Trac ecu's.

Does anyone know the interchange ability of these number ecu's. 89661-50020 and 89661-50042 ? Thanks, and finally this is my first post after a long time waiting.