I'm thinking either the coil, plug wires, or how about the PIP module inside the distributor. A friend of mine had a really bad stumling problem at cruise or accleration and it turned out to be the little module thing inside the distributor. I believe it's called a PIP but, of course, I can't remember what the heck it stands for. You can pull the cap and rotor off and see it down inside the distributor. What's your fuel pressure? Could it possibly be the fuel pump?
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1994 Red SVT Lightning #2019