My 1999 Isuzu Rodeo suddenly died and won't run.

I have a 1999 Isuzu Rodeo, 6 cylender with automatic transmission. It has over 240,000 miles on it and for the most part I have had no trouble to speak of in the last 6 years. I was surprised when while driving at about 45 MPH the car just shut off. I have gas, the fuel pump is working, i have fuel pressure on the fuel rail, the coil packs are firing and I replaced the spark plugs yesterday.The vehicle tries to start (the engine "Turns Over") but won't start and run.

I Need Help!!