i've a pontiac aztek 3.4, when gas is given it feels like misfiring?

cesar

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i've a pontiac aztek 3.4, when gas is given it feels like misfiring but if gas pedal is released and just pressed slightly, everything goes good till power is needed, air flow sensor was already changed. any clue what can it be?
 
Did you happen to figure out what the problem was?? mine is doing the same thing i changes the air filter fuel filter even dropped the cat from the exhast manifold and the car still has this problem???
 
here is what i found out... my abs light was on when this happened so while changing the right wheel bearing the wire was seperated from the wheel bearing. so changing the wheel bearing corrected my problem. accually i changed all four wheel bearings...
 
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