The fact that the car runs well indicates that it is not the ECM ( brain to mechanics who have little idea)
take the vehicle to an accredited service center who has experience on your make of vehicle and have the fault codes read and then fix the faults reported
SOURCE: 1994 Cougar XR7 stalls when you stop at red light while idling.
check all your vacuum lines for cracks and proper connections, (this sounds like a vacuum problem) good place to start..
SOURCE: Car not idling adn stalling when it is cold
sounds like the idle control vale is sticking when it is cold. It is located on the throttlebody right at the air inlet
SOURCE: 91 mercury tracer check engine light after starter replacement
when you disconnect the battery.when changing the starter.you lost computer memory.the computer is going through relearning its program.it effects idling.should clear up after driving around a day or two.if it keep stalling take it to the ford dealership to relearn to idle.
SOURCE: 1997 Mercury Cougar light and ruff engine start up
You have a vacuum leak. Check PCV hose on passenger rear of engine. Stuck open EGR valve can also be the cause.
SOURCE: stalls while idling and engine
Actually I am hessitant to respond to this one. The problem you are having COULD be many things, however my take is different than the others you seem to have. I believe that you are having timing issues caused by a Crankshaft Positioning Sensor, and/or Cam Positioning Sensor. Thesee are how the computer knows where they are and adjusts timing to make the engine fire at the correct time, thus it is called timing. The computer makes these adjustment is literally THOUSANTHS of a second, and if the sensor is off just a little especially at very high, and very low revolutions you will have a miss, which will at high RPM's "pop" due to it wanting to stall but because of the RPM's keep momentum, and pops but keeps running but at low RPM w/o that momentum, just stalls. I pray this helps you understand WHY I think you may have timing issues and why.
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
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