i would not start the car again until this is fixed. sounds like the chain and tensioner need replacing. the tensioner works on oil pressure and when weak will loose the spring tension needed for when oil pressure is not present. the noise at idle sounds like the tensioner is bleeding pressure off internally-really weak. if the chain slips, you can bend valves and that means pulling the heads-very exspensive.

pull both valve covers and look at the plastic chain guides. the inner 1 on the lh head is the most fragile of the bunch. because of the way the chain runs, it's the 1st to break. any broken bits must be fished out of the engine. pull the lower oil pan and get the pieces. they can get into the oil pump from there or the new chain can jump if apiece falls out of the timing cover. seen it twice.

while the covers are off, turn the engine by hand to tdc on the crank pulley. there are marks on the cams and heads to line up. keep turning the motor until the marks on the lh cam line up. then, look at the crank pulley. if the pulley is PAST tdc 7 degrees or more, you need a chain and tensioner.
good luck, chuck.