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Unread 11-24-2012   #1 (permalink)
Tripp is offline Rookie

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Granite Bay   California
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Question 1991 Mustang gt idle surging

My 91 has just recently started the whole "I'm a typical Ford and I don't want to behave when cold staring". This just started very recently, it surges constantly between 2500 and near stall out (approx) when I start her up first time for the day. Now it'll do this for about twenty minutes or until it gets up to full running temp then it's only happening intermittently for the next few mintues. Sometimes going as far as complete stall out while slowly accelerating up to traffic speed. Forget about quick launches or even passing gear accelerations for at least the first 5-6 miles.
Last night I put a timing gun on her and after pulling the vacuum advance pill I realized that without it, there was zero surges of any kind. I'm a bit baffled and could use some advice. Thanks in advance. Have a great weekend everybody.
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Unread 11-24-2012   #2 (permalink)
My 5.0 91 LX is offline Made Member

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Mcdonough   Georgia
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you can start here

Ford Mustang: Mustang Tech: Maintenance and Tune Up: EFI tuning part 2: sensors ,
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91 LX 5.0 HO , BBK SSI intake,MSD Pro Billet dist.,BBK adj.fpr, 75mm tb.73mm mas,BBK cai, Trick Flow underdrive pullies, 19lb injectors, 2 1/2" exhaust, BBK headers, x pipe, & converters, magnaflow cat back, Aod with TCI streetfighter valve body
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