Surging idle has been a problem to plaugue many stang owners, a lot of the time with no easy or simple solution. I had it, and the only thing that fixed it was to change the cam. I tried everything else, every trick, troubleshot every component. I R2'ed cam, problem solved.
Not saying this will help you, but something to keep in mind. I would suggest losing the "optimiser". I had one and it was a total piece of crap! It was an early model, and maybe pro-m has improved them since, but i wopuldnt take my chances. Send you meter back, tell them to remove the crapmiser and calibrate your meter for whatever injectors you are running.
good luck
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