Here are clips with the sound. Might be hard to hear but it's making like a loud fast grind/pop/knock sound as opposed to before where it just wouldn't accelerate. So clearly it's getting worse I just hope it's not too bad of a problem. Challenger noise - Google DriveThe behavior regarding acceleration and barely starting suggests a problem with the fuel system. Not too far fetched to believe the thumping may be fuel system (fuel pump?) related rather than driveshaft related. But the driveshaft being the source of the thumping needs to be confirmed/eliminated.