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I have a 1997 Ford Thunderbird 4.6L and I floor it my car wont go pasted 40 mph or if im past 50 mph and if i try to floor it wont go past 80 mph and then start to deacclerate.
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If O2 sensor the car will jump while accelerating. Could be that it is the catalytic convertor. Could be an issue with fuel filter, though unlikely. If its jumpy at 20-25 then I would agree with you.
I would check the driveshaft universal joints and the play in the yolk joints where the driveshaft exits the transmission and where it enters the differential. It could be the preliminary vibration caused by the deterioration in a universal joint, forewarning you that it's on the way out. Good Luck Vern
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