I just talked to the Dealer this morning. The Intake manifold gaskets need to be replaced. They are reprogramming the PCM and inspecting the Cam chain tensioner and guides front and rear (01M01). The cam chain inspection is a General Recall Campaign 00M12. This covers the tensioner and Intake manifold gaskets to 72,000 miles of 6 years after the start of the warrantee. Most of this work should be covered under the factory service plan. The dealer is checking for the Throttle Body Plate Sticking, which is 99M02. These are all Technical Service Bulletins Listed by Ford On their Oasis reports they print out at the dealer. If you ask for one they should print it out for you or you can get an unofficial copy at Alldata.com. For my specific vehicle the URL was
http://www.alldata.com/TSB/20/982015D1.html
I used Google to find this site using the keywords: 1998 intake gasket recall ford explorer 4.0.
These recall plans are only good if you tell them symptoms that apply to the individual recall campaign. They will not voluntarily let you use these like a safety recall. The symptoms to describe for my particular problem is rough Idle at cold start and a ticking noise. This will describe the cam chain tensioner and a vacuum leak i.e. bad intake gasket.
As I mentioned before I replaced my IAC at a ripping cost of 118 dollars with no results and no returns on electronic parts. So I hope this will help someone. If you have any questions of need more info reply to this message. If you want very specific info you can call Ford Motor Company Customer Relationship Center at 1800-392-3673. The web site to find this Contact info is:
http://www.fordvehicles.com/help/contact/