I've sent the pm back, but if it was making 12 psi before, with the new cooler etc it may be making quite a bit more, which could be contributing to your problem, reading your description here makes me think you may be experiencing some torque managment issues. As mentioned before, generic tunes can be a bit hit or miss on a standard car and a lot worse on a modded car, you really need to go over the basics, like plugs, coils etc, but you should be getting it custom tuned