Perhaps you'll find more help in the 5.0 forum, moved your thread here-
Can you describe this any better?
When you're at a stop and hit the gas to start accelerating, does it act normally?
Does it shift normally except for when you're already moving then you let off the gas/try to get back onto it?
What speeds and in what gears does this issue occur most with?
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2003 Regal GS - the beater/daily driver - somewhat stock (yeah right). No its not a mustang, at least it's blown.
2001 GT Black on Black 5 speed
MM Strut Tower Brace/Weld-In Subframe Connectors/Koni Springs&Adjustables/Cobra Brakes/Cobra Rack/Tri-Ax/3.73s/SCT Tuner 56k miles