Disconnected throttle micro-switch, problem solved. So I don't have the fuel savings of cutting fuel, no big deal. I thought that switch had more than one function but now I know there is another switch at the throttle plate that sends info to the ECU for idle and WOT I have no worries.

I've replaced the IAC with a manual gate valve a few years ago and now I've disconnected the coasting fuel cut. A bit unconventional but the car runs very well.

Thanks for all the replies and good info gentlemen.

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1988 300E