RW> That should work...when the IAC is carbed up (just dirty), they usually   
   RW> respond well to a good cleaning.   
      
   This time, that didn't seem to do the trick.  I had replaced the IAC two years   
   ago when the truck was going between idling very high and very low and back   
   and forth - just sitting in park.  Replacing the IAC fixed that problem a few   
   years ago - but this seems to be different.     
      
   I keep going back to the spark plugs since they have never been changed and it   
   has 145k on it.  Six of the eight of them shouldn't be too difficult to   
   replace, as I can access them.  Two of them are under other things that would   
   have to be removed (the throttle body stuff).   
      
   RW> The 4.7L then, not the in-efficient combustion chambered hemi...it needs   
   RW> two spark plugs (one fires on the extra stroke) to clean up the exhaust   
   RW> as   
   RW> it is passed into the system.   
   RW>    
   RW> Be glad it's not the hemi with 16 spark plugs...   
      
   Yes, this is the 4.7L V8 (non-hemi).  I have never replaced plugs with coil   
   packs, but assume it isn't that much different.   
      
   - Mark   
      
   --- WWIVToss v.1.50    
    * Origin:  http://www.weather-station.org * Bel Air, MD -USA (1:261/1304.0)