Rx300 Is Hesitating When Pressing The Gas

[picturethis]

I have a 00 rx300 with 30k, I let the car sit for a month I go to start it and it clicks , I took the battery out and put it on a charger, it read 15v , So I charged it up. and the battery checked out good and held a charge. Now when I start it up I hit the gas and the car hesitates like its not getting gas or maybe a clogged fuel filter. After the car is hot it will accerate normally, any ideas whats causing the problem?

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Forgot to add the car isnt flashing any codes

[SKperformance]

you have 2 problems a charging issue and an engine problem

your above is very vauge for info to give you an answer.