[T3] Question about D jet idle issues 73 T3

[William J]

Has anyone run across issues with an unstable idle that clears up with the IAD temp sensor is unplugged ? It only shows up when there is no load auto trans in park engine warmed up . If I give it gas from 900 RPM idle speed and watch the tach for lack of a better term it seems to stuggle until it reaches 2000 RPM. 

 I first noticed this when I opened the tail gate with it warm and runing I could hear an erratic miss out the exhaust , it's not one cylinder . Also if I am driving say 30 MPH and let off the gas quick I hear a slight popping out the exhaust. 

 The only thing that seems to cure this is to unplug the IAD temp sensor . I assume it is running lean. 

 It has all the proper E system parts and I have not found a vacuum leak so far. With the IAD temp sensor connected and driving under load it seems fine other than the popping . 

 It has the electric AAR which does close although it s eems to take longer to close that  it used to. I just changed the MAP to a NOS Bosch #  0 280 100 116. It holds vacuum and the resistence is within spec. Compared to the old one with the temp sensor plugged in it's better yet still stuggles with no load . My voltage is 14.3 at 1500 RPM. I don't have access to read the actual mixture I am just going by the way it acts. 

William

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