First thing this am I checked out the idle control unit. It looked brand new inside and out the wiring harness looks fine as well. I have researched this forum but cannot seem to find a match for my problem. The closest post I found was from 11-11-2002 by M.B.Doc who stated these idle problems come from faulty sensor inputs to the CIS-e ignition control unit. I saw a aftermarket ignition control unit for under $60.00! Can any one recommend these units ?For that price I would be willing to gamble, although I don't want to be a "parts changer".Or is there a way to bypass the unit to see how it runs.We did this on my 1975 280S and it worked fine except the tach no longer functioned.