just changed the fuel filter a few months ago and she's got just under 50K i noticed that when i take her out n its cold (the engin) it does the complete oposit of once it warms up example: when it hesitates..its only up to about 3K RPM's then it takes off and once it warms up it drives like **** after 3K wouldnt it throw a code if it was the fuel pump or injectors? i would just change everything untill i fix it but yea...im kinda on a limited budget