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alright so my civic wont accelerate like it use to. i start off in first then i get to about 20mph and it wont go any faster and the rpms stay around 4-5 so i have to shift and it does the same in each gear. the rpms wont go past 5000 and i can barley hit 55 mph on the highway in fifth gear while flooring it. im not sure why its doing this. i just changed the fuel filter, spark plugs and wires today. there was oil in the spark plugs so i also changed the valve cover gasket, and the spark plug gaskets, but its still wont accelerate properly. its really bugging me. can anyone help me out!

 
Rep Power: 0

I would check the tps sensor and the map sensor first.. then check the fuel injectors and make sure they are all functioning properly.. then finally check the fuel pump