Robert J. Korn wrote: > Its marked 86ASDU SERV NO 1227747 > > The eprom is ASDU 9567 > > Does anybody know this beast ? It is the ECM used in late 80's Chevy pickups with TBI. C3, 160 baud. No IAT sensor used in this app. I don't know what ASDU is (for the specific application). Scot Sealander Sealand at clarityconnect.com