Over the past few months, every now and then when I come to a stop at a red light and sit idle for anywhere from 20 seconds to a few minutes, something in the engine causes a vibration to travel from the engine down through the car. This is only when I am not moving (i.e. not pushing on the accelerator) so I am thinking that there may be a problem with the pressure in the fuel line.
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Zack, did the Engine light come on?? If you can get it over to one of the big-box auto parts stores, get them to check for any codes. May be Throttle position sensor (TPS), cracked hoses at connections.
If it's running rough, chances are that it's misfiring. If the Check Engine light is flashing/blinking, it is definitely misfiring. If that's the case, drive it as little as possible... Or straight to the mechanic because the more you drive it while it's misfiring, the higher the chance is of you ruining your catalytic converter.
You need to go to a shop with a code reader. The check engine light was telling you something and you need a code reader. Depending on which country you are in, if in the states autozone may have it for free.
Whatever initiated the light is now messing up the other parts of the car.