I am having trouble starting my 1991 ford mustang lx 4 cyl 3.2 l

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I am having trouble starting my 1991 ford mustang lx 4 cyl 3.2 l when it dose start it runs really ruff and when i put it in gear and press on the gas pedal it does not accelerate but acts like it is not getting gas ,backfires and dies and if i can get it to idle ... the hole car shakes i have had the fuel pump and filter changed , new spark plugs and wires . and new timing belt