Up for sale is a Working, in excellent condition 1987 Datsun / Nissan 300 ZX Engine fuel / engine control module. Part number-- A18-676 M80 / 2371021P61 24 Unit , This ECU came out of a 87, But my list shows this should work in earlier models, and give an improved diagnostic mode. Buyers responsibility to verify if this is right for their car. As you probably know, this is a pretty hard one to find at a reasonable price. As always your best bet is to match the part number to the one on your original ECU. These units have been NLA for quite a while now, and are not at all easy to find, at any price much less as fair as this. These are usually fairly reliable, however can easily be damaged by wiring faults or voltage spikes (caused by a faulty alternator). A faulty ECU can cause problems ranging from a bad idle control circuit to random no injector pulse signal (causes no start or random cut outs) & many others.