Loud bang randomly 03 v8

Moist

Member
It's coming from right next to the transmission, just aft of the engine where the two mate. It feels like something kicks the floor rather hard.

It consistently happens immediately after the car stops, and sometimes about 30 seconds after the engine stops. It does happen intermittently while driving, but it is usually drowned out by the cacophony of other noises.
It is accompanied by a misfire on occasion, but this is only during startup. (90% sure I need new plugs)

I thought it might be the exhaust, but I can't get the play required to force it to make the sound/impact something.

I'm not sure what causes it, and have been chasing it for about two or three months. I really don't know what could be moving that much when the car is off to do that. Any ideas?

(EDIT: I'll get a video of it later.)
 
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