If the IAC was bad the car wouldn't run at idle or it would die when a load was put upon it.
go to autozone.com
doesnt have one
computer control
There is no heater control valve fitted on a Ford Escort. The heater matrix is directly connected to the engine's cooling system. To reach the heater matrix, you should remove all the facia unfortunately... :(
The idle air control valve on a 1990 Ford Escort is located on the intake manifold. An idle air control valves function is to control the amount of air that is allowed to enter the engine so the idle can stabilize.
Evaporative Emission Control System control valve malfunction. You need a new evap control surge solenoid valve.
idle air control valve error.... try to clean it up
It is under the air filter housing.
A vacuum leak or a faulty IAC (Idle Air Control) valve.
The 1993 Ford escort did not come with an EGR valve. It is one of a few year models that do not have one.
Intake manifold runner control aka imrc valve
It is located under the intake manifold between the engine and the firewall.