Car Sputtering around 45-50 miles an hour, RPMS not fluctuating?

I just recently bought a Ford Taurus. When Driving (Especially Accelerating) the car sputters. It just started yesterday. The RPMS do not fluctuate, so I don't think, and hope its not the transmission. Any ideas?

It's probably the ECU iv seen that problem a couple times and both times it was a computer issue and both times it only happened up wards of 40 mphs

Technician. Could well be fuel pump and since that thing is inside the gas tank, it's expensive to replace

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