Paranoia

[BIGJake111]

Just washed the car, after washing steering felt very light, took car for a dry off drive, drove fairly hard, no more so than usual, everything felt great as ever, steering still being oddly light but it felt good from it.

Get back and with windows down as pulling into garage I hear a second rattle, easily defined as separate from my cat rattle. Brake and the rattle is gone, move forward more and the rattle is back. Parked the car a minuet and went back to investigate, started car up and idle dropped very low after the initial rev, even close to stalling, but only on a bounce, then steadied out, put the car into reverse and once moving the rattle was back. Brake and rattle was gone. Pulled forward and rattle was there once the engine power was moving the wheels. I then depressed the clutch fully and rolled back, no rattle. The rattle is coming from the back of the car, likely back left and is in tune with the engine, yet it is only present when rolling.

Any suggestions, am I crazy? Also started the car a third time to be sure and idle was normal then.