hey guys, i recently had my car verso tuned and ran sweet for the first few days. Then after that it started playing around when it been sitting for a few hours, jump in it and let it warm up again then coming onto boost the car jerks real bad then hit boost and its fine. Once i have been driving it for a while it settles down but can feel it hesitate a little when spooling then fine? Also it back fires alot more then it use to aswell.

Could this be a fuel delivery problem or is it possible for the tune to reverse it self?
The car is a 01wrx mods are aps cai, gfb bov, warbro 500hp fuel pump, silicon intake and verso tune.

We are flat out at work so i can't get the chance to take it to asg.
Thanks

Matt