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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.
Check out the simple stuff too. I've had engines that misfire because a wire burnt through. It would arc only at higher rpms at first, then as the insulation burnt off a little more, it would ground out all the time. I would check all my wires/plugs/cap/etc... as well. There's no feeling like one that you get after you troubleshoot something for days to find out it's something simple. LOL
mostly accel and constant velocity. i dont think it has come on during decel. it comes on in the normal cruising rpm range, if i nail it, it won't come on.