You should find the ECM (Engine Control Module) also known as PCM (Power Control Module) under the right side of the dash (passenger side).
The ecm (engine control module)
I just learned something ! That the EEC computer and the powertrain control module are the same thing ! On the 1991 and 1992 models the powertrain control module (PCM) is located in the right front passenger area behind the right side kick panel.
The Ignition Control Module is on the top left hand side of the engine under the Ignition Coils.
Not knowing what module, the ignition control module is behind the coil packs. 3 bolts hold all together against block, under the intake lower to mid center U
It is mounted on the radiator support frame in front of the battery
shift control solenoid.
in some of them it is built in with the distributer have to by the whole thing about 350.00
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
where can i purchase a Silverado 1500 Extended Cab year 1991, Dashboardcolor burgurdany
It's probably attached to the same bracket the coil is mounted to
If you are talking about the transmission control unit, it is behind the carpet in the passenger footwell.