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.
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electrical or fuel delivery for the stalling. The throttle staying open after you rev it sounds like possible throttle body or throttle cable issue to me. WD-40 your throttle linkage and the throttle flange inside the throttle body. Press the gas several times when it's off, then let it sit for a little. That'll give the WD-40 time to work it's magic. If that doesn't fix it, vacuum is a likely culprit.
IF YOU WANT THE EASY WAY OUT OF VACUUM SYSTEM TROUBLESHOOTING:
Go to a garage and see if they have a smoke machine for vacuum systems. They basically plug into the vacuum system and pump smoke into it. Anything that isn't sealed properly/damage will, obviously, leak smoke. It's going to cost some money, but in my opinion, it's MUCH better than having to do it yourself.
In such a world as this does one dare to think for himself?
The paradox of power and peace will destroy itself.
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