Hi i have a 2005 chrysler 300c 5.7 l hemi

Hello, if your shudder goes away when letting of the accelerator and then re-engaging it eventually brings it back, you could have a vibration from your torque converter. You could also have an axle shaft out of balance. Testing is required. Sometimes a fluid change can help if it's a torque converter vibration. But sometimes it will require converter replacement. A software update may be available to influence this as well.

Consider having a *mechanic* test drive the car.