问：加速时没有电源

我拥有一个5速手动燃料注入起亚塞菲亚。我买了二手，然后打开了检查引擎灯。它运行完美，所以我忽略了警告灯。在几个月后，我感到非常小的打ic，何时加速。还不错，所以我放开了。一个月后，当我以稳定的速度保持煤气踏板时，它开始非常犹豫。然后，犹豫不决的人变得越来越频繁，直到变成了大声而慢的繁重运行的回合 - 然后它将正常运行。这发生了。我将汽车升至高速，以使其以正常的速度保持运行，因为速度较慢会导致它犹豫。几周后，它除了闲逛时大声，沉重和摇摇欲坠，什么也没做。 It almost shut down when I pushed on the gas pedal. Revving it up to high speeds didn’t help it run normally anymore. Up until now when I start the car it runs heavy, shaky, loud and high revving does not good at all. I did replace the exhaust system, spark plugs, fuel filter, fuel pump, fuel pressure regulator, air pressure valve, air idle control. But none of these parts helped. I can no longer drive the Sephia because it has no power when accelerating, and the engine shakes and runs loud. I haven’t replaced the injectors, the injector wire harness, or the coils. Except I did replace the coils and the car still hesitated, so I took them back to the store. When my alternator belt broke I drove the car home. When I put a new alternator belt on all the problems returned. Can you please help me fix my car? Do you have any ideas what this could be? Thank you.