Ok so my 07 GP was running fine all day until just after before going home i filled up a full tank of gas for the first time in a while. When i floored the throttle half way the engine sounded a little low but with power but the car was not going that fast as it should be. instead it just speeded up very very slowly. Also it like jerks when i let off, i took a look at the engine and everything as fine. I get back on the road to test and when i put the throttle down all the way the car pauses and then the engine puts out all its power as normal but not that loud of an engine and the car is speeding up so slowly but in second gear the car picks up very quickly. So what the heck is wrong now, when i punch it at half or full throttle the cars engine puts out the power but the car is not speeding up like it should be and again jerks sometimes when letting off. And it seems to happen in first gear, when in second it goes but sometimes not really, i thought because the engine was so hot from driving but now when it got a little cooler it still does it. The only thing i think may of done something is that in teh parking lot you guys know those white or blue or whatever color stone things that are on the floor. You know when you parked the car the tire bumps into it the little stopper thing in a parking space. Well i did not know there was one in front of me when i went forward pretty quickly while turning right and only the front driver side tire ran over it hard but the car seemed fine but ya could that have damaged something? really need help and hope i did not screw anything up.