I have an 03 4 banger. It has 154K miles on it and this is the first problem I have come across... When I take off with the a/c on mostly, the car is very hesitant to move, while driving, I have to punch it to make it move. When I get on it, it hesitates at first but at the top of every gear, it opens up and goes like it normally does but as soon as I get to the next gear...no power until the top of that gear... I don't know everything about cars, but I do know a thing or two but this has stumped me... It does it with the a/c off too just not near as bad or as often. Any help would be great. I appreciate it.