my rpm gauge goes up and down on 2004 Chevrolet Impala

when traveling up a ramp I seem to have no power and when I am driving normal it seems like my impala wants to accelerate.

Asked by for the 2004 Chevrolet Impala
i would have the fuel pressure checked and the cat coverter checked for blockage.

thank you for your advice. I'll have my mechanic check it for me.