Cadillac Repair: 1989 Cadillac Seville, distributer cap, vacuum leaks

Question
QUESTION: Hello, I have a 1989 Cadillac Seville. This car has been very well maintined, both interior/exterior and mechanically. Recently, I have been having some problems with it. First, I want to explain that about 6 months ago, I did a basic tune up on it. I replaced the wires, plugs, oil/air filters, distributer cap, and radiator cleaning, etc, on it. A couple of months after that, I had to replace the radiator hose because of a leak. It went well. Then shortly after that, as I was coming back from a small trip, the car started to idle very high! I got it home and shut it off. I was told (by recommendation) to change the ignition control module, which I did. The car idleing went back down after a few seconds once I started the car with the new ignition control module on it. Now, when I start it and the engine gets warm, the car stalls on me. It doesn't matter if it is in park or in drive. I restart the car, and it starts right back up. No hesitation. However, it will stall again, ususally after a few moments. The only way I keep it running is by keeping my foot on the gas, lightly. I will tell you that it does need some minor exhaust work, but I do not believe it is the cause. I was told to check out the oxygen sensor, but then again, I was told it couldn't be it. I was also told to have the idling turned up... which I have no idea how to do. This car is a great car... but I am just stumped on this. Can you please help?

ANSWER: Ajay,
Turning up the idle on these cars just isn't that simple anymore. Would be nice but...
Anyways, first thing to do is have somebody verify all the basics;
1. Timing
2. Min-Air setting
3. Check for vacuum leaks
4. Verify proper EGR function
5. Proper connections at all electrical components

These are the kind of things to look at first. It could even be something as simple as a bad ISC (Idle Speed Control). Have you ever done (or do you feel up to doing) diagnostic and tuning adjustments beyond what you've said you've done?
Do you have a service manual for the car? Do you have a good DVOM? If you are ready, we can proceed with doing some tests/adjustments but beware, if you don't do the tests/adjustments correctly, you could make things worse.
Let me know what you want to do.

---------- FOLLOW-UP ----------

QUESTION: Hello, and thank you for getting back with me. First, I checked out your cars... wow. I actually had a Hyundai Sonata and loved it for a little car. Yours is very nice. And, the Cadillac Fleetwood looks really nice. You guys did a great job at getting back to looking good from the accident. I'm sure it was expensive and very time consuming.

Anyways, I've already had the timing checked and it is timed  correctly and all parts of the timing are running at 100%. I'm not sure what you mean by the Min-Air Setting. I've also checked the Vacuum leaks, and from what I could tell, there are not leaks. I've also tried to make sure all vacuum hoses were attached properly. The EGR funktion has not been checked. I'm not sure how to check it... other than just replacing it. I've thought of the Idle Speed Control, and honestly, I still have a feeling that may be the problem. As, when I replaced the ignition control module. But, someone told me they were to of the same, just different names. But, as you mention it, I did replace the ignition control module when the car first starting acting up (when the idling went extremly high). But, when I replaced it the idling returned to normal. You are the second person to mention the Idling Speed Control. Exactly where would this be located. And, no I do not have a repair manual, but I will go get one at the local Auto store, just in case. I'm ready to get down and dirty with this car. It has been such a good car and I keep very good care of it. Its indeed a classic.

Answer
Ajay,
Min-Air (minimum air) is the setting that establishes the minimums for idle etc.
In order to set it, you'll need some basic tools and a DVOM. You said you're getting a manual. It "should" have the procedure in it. If not, let me know and I will go over it for you. Beyond that, it might be a good idea to check the function of the ISC. Again, the manual "should" show this procedure but again, if not let me know.