Thanks and I will keep you guys posted.
 

Thanks for all of the help and hopefully in a few days I will have this idling issue resolved.

Did this start out of the blue or after something was worked on under the hood?

It was like it when I purchased the car. Still have cold idle issue+ when coating.
 

When I purchased this car it had this issue. I thought it was the IAC or TPS. I changed both and reset idle and also adjusted volts on TPS to below 1 volt. I still am having cold idle issues. When my tank was half empty yesterday I added 87 octane hoping it would help it with idling and also with jerking when de-accelerating. No such luck. Will adjust the throttle body set screw and fill entire tank with 87 octane when near empty. Hopefully this will help, if not I will put her in the shop as soon as it is in the budget.

Could even be something as simple as the "ACT" sensor

http://i201.photobucket.com/albums/a...sjsjflssjs.jpg

http://i201.photobucket.com/albums/a...ct20sensor.jpg

http://i201.photobucket.com/albums/a...jsjsfklajs.png

They are usually pretty cheap at the local parts store and very easy to change.

It's ok to run the Sea Foam thru the car if done properly, but to much can actually not be good for it.

It's usually a good idea to check your spark plugs after doing it, because it can actually foul out your spark plugs since it works "that good". But again it really depends on how and how much you run it thru the car.

I don't think it's any type of "fouling" issue.......unless it's fouled spark plugs possibly. These engines are always filthy inside since they re circulate crankcase vapor back into the intake, but apparently it doesn't bother them at all. Really sounds like a vacuum leak to me is the most likely cause. Incidentally, what kind of plugs are you running in it? I have found that they really don't seem to like Bosch Platinums for what it's worth.

Update on idle issues.
 

I completed a base idle reset again and it seemed to be idling ok. When I turn the heat the idle lowers and nearly turns off. I will see how she runs in the a.m.. My car has motorcraft spark plugs, but it need to probably change them soon for a tune up. There is also a pretty bad exhaust leak on the passenger side I will address as soon as possible. I wish she was ready for the 50th Anniversary Mustang car show in Charlotte, but she is not ready. Maybe I will be able to show my car at the 51st Anniversary next year. Thanks for all of the help.

Silverfox
 

did you resolve your idling issue?

silverfox
 

I had same problem,changed everything,nothing seem to fix it.I performed a smoke test and found I had leaking intake gaskets,The lower ones were sucking air causing the idle surge.If any questions gimmie a shout dude