We just had a simalar problem with our 88GT,, when it warmed up sometimes it really ran like crap, wouldn't idle, stall out sometimes backfire, missing.. This drove us crazy. Took it to a Mustang shop here and it took them sometime to figure it out. What they found was the distributor module (think that's what it's called) was shorting out when the engine warmed up causing all kinds of these problems. Once the module was replaced - haven't had a problem since.
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