Unsolved rattling when accelerating and engaging clutch

#1
Hello,

I have a strange rattling sound that started about 10,000 miles ago in my 2005 corolla with 133k miles. I thought at first that it was something loose in the wheel well. This does not seem to be the case any longer. It rattles when i engage the clutch upon take off or any time i accelerate when driving. There is no rattling at all when i rev the engine or at idle. It does not rattle once the car gets up to speed. I do not notice it particular to any RPM. I thought it was the throw out bearing but it does not rattle when i put the car in reverse and accelerate in reverse. It seems to rattle also when i drive over rough terrain. I have tried jacking up the car and looking for loose hardware with no luck. Heat shields are solid so could it be suspension? I have had a mechanic look at it and he thought it was an exhaust leak but now he's not sure. Please help!
 
#3
Sway bar links seem to be solid. Have not looked at suspension arm yet. I'll look at the engine mounts again but they seemed to be good.
 
#4
Once I had a horrible noise below, apparently pass by a stone road and the stones got between the suspension arm and the chassis of the car and made a noise as if something was going to come out
 
#5
I recently lost a 12 mm socket. Maybe this could be the culprit. Still have never found it. Would make my day if i could find my long lost socket and repair a rattling sound at the same time!
 
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