Why wont my car accelerate when I stump in to the gas. It has a hard time to sta

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It has a hard time to start but when it starts up engine sounds normal and could drive it around but if you stump to the gas it will not respond like it should .when the rpm hits like 21|2 close to 3 it throws it back and it does not go any faster it does not responds like it should. Other wise if you are driving under range of 2|2 or 3 it would Doe just fine I drove it from my brothers like that he lives like one hour away and it was 60mph as long I slowly press the gas to catch up speed. And this is what I replace and did not do any difference but some things where use, fuel pump was use and map sensor and I bought the new and spark plugs and filter are new and and the throttle position sensor I think it works OK