Did you wash the engine? Like with a pressure washer? And if you did, did you cover the electronics like coil packs, fuse box, etc. if you did you may have just loosened a connection. Check your spark plug cables at the coil packs by unplugging and re-plugging. Look at all the sensors and connections and make sure their plugged in and check the fuel injectors.
1998 Bright Atlantic Cobra - 3:73's, BBK ls, Pro 5.0, 96 Cobra STB, Borla XR-1 Catback, Custom Catch Can, Spec clutch, MM Firewall adj, FRPP wires, RSD, Spoiler delete, 245/275 BF Goodrich g sports on chrome 95 cobra r's
1998 V6 Mustang : SOLD!