2005 Chrysler PT Cruiser My car Jerks

Hello. My car has been acting up in the past few months. The car jerks and kinda putters after it has been driven for a while. At first the car runs fine and then after about 30 or more minutes of constant driving it starts to jerk when you try to accelerate too fast. I'm not sure what the exact RPMs its at when it does this but its a little between the 2 and the 2 1/2 on my gauge. When you're driving and you go anywhere near that mark it jerks and sometimes dies out even when you come to a stop. The sparkplugs and a few of the wires have been replaced. I have used the fuel injector cleaner, the fuel pump was relaced last spring as well as the sending unit. I hope someone can help! I dont really have the money for a garage but if I have to I will take it but if I can have this fixed on my own I would rather do so. Thanks