Moody Accelerator

[ippap]

Nissan Altima 2009

Everything in the car looks fine except the acceleration. When I press the accelerator pedal, it revs less than what I push for. Then if I keep pushing, it accelerate suddenly and the "fuel consumption indicator/bar" on the dashboard (I don't know the official name for it) goes to the extreme right indicating that a lot of fuel is going to the engine while the speed of the car is still very low.

This tell me that when I am pushing the pedal and before it revs high and accelerate suddenly, the fuel also isn't going as mush as I push.

What do you see in that?

==========================
Additional Info:

I did some research on the net and found that it might be the throttle position sensor (TPS). But when scanned it, the report showed only the knock sensor having a problem! I know that the knock sensor is not about the problem described above.