I have an 01 1.8t and its chipped with a garret chip, and i noticed after it being chipped for a while, now when i accelerate hard the rpms jump a little and there is a rattle in the car and then it seems to catch and accelerate much faster. its not everytime i accelerate hard though just certain situations like on the highway going 70 then punching it at about 4,500 rpm it rattles hard till about 5,500 or i let off....

 

Does your car have any hesitation when its idle?