You put your thread in a forum specifically for people who have tuning questions about things like injectors, MAFs and aftermarket tuners such as Tweecer, Moates or Anderson PMS. Therefore you post will not been seen by people who may have an answer but do not visit the Tuner forum. Convertible top problems have nothing to do with tuning an engine.
My advice to you is to twofold:
1.) Send a PM to one of the moderators and have your thread moved to 5.0 Tech
2.) Next time you start a thread, think about where it goes. If you are new to Stangnet, please read the terms of service and give extra thought to where your new thread belongs. There is some help in the text below to help you find the best place to start your thread.
Tuning problems go in 5.0 Tuning, with specific emphasis on modifications to the injectors, MAF and computer, along with aftermarket tuners such as Tweecer, Moates or Anderson PMS.
General tech problems go in 5.0 Tech. Tech is for
suspension, electrical, brakes, body, engine repair and general troubleshooting on the computer & trouble codes
Tall tales about your 5.0 Mustang, pictures of your 5.0 Mustang project and stories about your last trip to the race track go in 5.0 Talk.
Do this and you'll get the best answers quicker and not get lost in the maze of posts about everything but the type of problem you are having.
Having said that, here's some help...
The TFI module mounted on the distributor is usually the culprit for a high speed miss on a warm engine. If the problem does not occur when the engine is cold, the TFI module is definitely suspect. You may need a special socket to remove the TFI module, but most auto parts stores will have one for $5-$7.
Be sure to use plenty of the heat sink grease on the new TFI and clean the old grease off the distributor.
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Automotive Tools Specialty | Auto Mechanic & Technician Diagnostic, Testing Equipment | Thexton
diagram courtesy of Tmoss & Stang&2Birds