We have a 1999 expedition eddie bauer edition that we just purchsed 2 months ago. The truck has been running without any issues an then all of a sudden the other night on the way home there was no acceleration after 30 mph. When my husband did push on the gas pedal it would sometimes backfire and spit and sputter and sound like it wanted to go but sadly it wouldn't. My husband has changed the plugs and coils but we aren't sure what to do next or if this is a known issue with this truck. Any advice or help would be appreciated.