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How worked over is this car? Motor swap, etc done by previous owner when you picked it up?
The standard "stumble" that many FC owners had at 3800rpm was the bad ground as was mentioned above - you're describing something different.
When you hit that "wall" does the car just simply bog down or shut off?
What color are the secondary injector tops? Are you sure they are S4 T2 injectors as appropriate for the car? Does the check engine light come on at all during any of the symptoms?
I'm just trying to weed out a few things in my mind - its just all to common (especially these days w/ all the "drifter" scenes running around) to pick up a frankenstein car that somebody butchered and now you - the good owner, is stuck with figuring out what they did!
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