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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I would go though the basics first, set you tps and idle, clean your idle air, and get your timing right. I just added 1.7 rockers and ported my heads and had a bit of surging, but after I adjusted it a few times, it went away.