disconnect the battery for an hour and reconnect, while battery is disconnected, check every single harness and make sure they aren't chafed, split, or burned; and make sure they're all connected tightly, I threw $200 at a 5.0 with the same symptoms and it ended up being a loose connector for the fuel injector harness (the big one that all of the injector wiring runs through, 2.3s have the same kind of connector) at the back of the engine.
__________________ 1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4 tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".) | 
running lean and missing? 1993 Mustang 
