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I have noticed that if you keep the 'A' pedal down it simply revs beyond 3K and doesn't actually accelerate. The trick is to ease off the 'A' pedal, see the rev coming down and then accelerate again. This will save fuel also. You will see it cruising at around 45 miles just above .5K rev when you do this.
Check idle speed, air flow speed, oxygen sensors . Check fuel manifold pressure. If the engine runs ok but will not rev up check the cat converter by hitting with the heel of your hand and listening for rattles as they are prone to failing and blocking up the exhaust system which stops the motor from accelerating
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.
if your vehicle slows from 70 downto 60 with no change in revs ,then the transmission is slipping .. imust say i dont believe that the speed drops back without the revs dropping down too, i am not calling you a liar ,i`m saying you are not making accurate observations , and without those we are just guessing .
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