1988 Chevrolet Corsica

Engine problem
1988 Chevy Corsica 4 cyl Two Wheel Drive Automatic 150000 miles

While I was driving on the interstate going 70mph as normal, my car suddenly lost power, I am to give it a little gas, but depressing the gas pedal more than 1/4 of its travel causes the car to start to backfire, and absolutley no power, I can only get it to go around 40mph on its own, the biggest problem is that it happened suddenly and for no apparent reason, the oil is fine, is getting good fuel pressure, maybe a problem with vacuum lines, but I am really having a hard time because I cant find anything else wrong with it
February 13, 2008.

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