i just bought my GXE and recently had my spoiler put on. before my spoiler, the car ran great but since i've put it on, i'm not getting as much response when i press on the pedal. i'm having to press down more to get the car goin then from before. I don't think the spoiler is the cause of the problem. I kind of suspect the nissan service of tampering with my car. or it could be that i'm just a crappy driver. is there anything that i can do?