1989 Ford Tempo

I'm not sure of the miles because we recently had the engine replaced. It starts fine but stumbles. It will pop when you press on the gas until you let off. It seems go bog down. Also the gas mileage is bad. New spark plugs, wires, air/fuel filter, oxy sensor, distributor and rotor are new. Please help!
Just me
December 1, 2006.

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