Q: Rpms Rev to 3000 but car does not accelerate pass 35 mph

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At first car sputtered a little between 1000 and 1500 rpm. Gas mileage was also bad so I replaced spark plugs. Still a problem so I thought maybe water was in gas. I used a bottle of Heet to try to get rid of water. Still problem existed. A month later stopped at red light began to go when light turned green and car did not want to go pass 35 mph but rpms went high. In the beginning it seemed as though car wanted to breath better. I thought maybe it could be o2 sensor or fuel pump/filter. Someone suggested cleaning fuel injectors or carborator. Any help will be appreciated. Thanks.

My car has 101582 miles.
My car has an automatic transmission.

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