if it's doing it right after it warms up a bit, i'd be willing to bet it's your ignition module... it's the little grey thing that bolts onto the side of the distributor... change that and see if it fixes the problem. they're cheap anyways. 
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85GT Convertible soon to be sold...
67 Mustang 289. Holley Red electric fuel pump, 4 speed toploader, dual exhaust, torq thrust IIs (real soon!)
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