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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.
Well your messing with the air flow so I would say the mass air meter was trying to adjust and it was to much! Stupid question? Why would you pull your air filter off with the car running?
The MAF cant get a good reading without the airbox so it freaks out. Thats why i wont use an open filter. Besides, better chance of ingesting hot air which doesnt make much power.