MSefi.com read only forum (Jan.15,2018)

91 Mustang 5.0

I am getting most of the VE map tuned pretty well, but I am having trouble with the idle.

The car has a TFS-1 cam (221/225@.050 112 lobe sep retarded 4*). It wants to idle the best at about 56kpa at 900RPM with no surge at all, but if I rev it and let off real fast, it wants to surge, and then corrects itself. Same thing happens when Im driving and push the clutch in or come to a stop. I have tried richening it up and leaning it out and it still seems to do it either way, is there a setting I missed or something in the Accel/Decel area?

I did a search, but I couldnt find anything.

is there a thread that explains this very well at all

What is your timing doing? I noticed on My El-comino that leaving the timing curve flat at and near idle made it much more steady.

timing is locked at 10 for now.

is the MS controlling the IAC motor?

could you post a data-log, also it would be helpfull to know the code version etc.