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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 changed intake ,throttle body ,distributor, msd box and headers. after everything i noticed my headers were glowing red. i adjusted timming to 10 degrees.
the intake manifold has a very touchy procedure and bolt pattern you MUST follow when you tighten it down, if the procedure is not followed for upper or lower manifold, you will not establish a proper seal.
In your case unmetered air is entering your engine, causing your headers to glow red, and is unacceptable.