Car wont shift as a i get on it?

bugze10

New member
Its an automatic tranny it shifts fine and smooth if i keep the rpms below like 4-5k but if i try to floor it or get on it hardier the car starts to stutter but wont give a go, if i then let off the gas and give not as much it shifts fine. Could this be a timing belt issue? or maybe ecu?
 
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