My 91 cadillac fleetwood keep stalling out when i come to a stop or a slow speed it is not a bourgham it is a sedan how do i fix it

Radiator cooling fans not working? The ECM is protecting the engine by shutting it down.

Where is the starter relay switch on a 91 Cadillac Fleetwood

Check with the auto parts store to see if they both have the same part no's. It's quite possible they are the same.

If you can check the part numbers stamped on the two different pumps and they are the same then that answers your question.

It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.

The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.

ANY TIME DIGITAL GAUGE GOES OUT YOU HAVE TO REPLACE IT.

Security system is active, look in your owners manual to deactivate

I am assuming this is while you are driving the vehicle? The light should come on and turn off at start up, as the ABS computer runs a self check. If the issue presents itself while driving, it is likely a wheel speed sensor that is starting to fail. If the computer looses the signal it will turn on the dash light, when it sees a signal again it will turn the light off. Could be a broken wire between the chassis and wheel speed sensor or a bad sensor. If you can, check the ABS codes, they should be stored.

there are most likely alot of vacuum leaks or the carb needs the mixture adjusted.

try cleaning the inside of the MAF sensor and do the following procedure as well.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.