regarding the timing chain-

to check for chain stretch, pull both valve covers and with a 24mm socket and ratchet, turn motor and look for line up marks on cam towers. the left cam might line up and pass before the right. this is not critical, unless it is quite a bit. when the mark on the right cam is on, look at the crank pulley. all 3 marks should be close to 0. if the crank is 0 to 5 degrees past, don't worry about it. 6 degrees or more, the chain should be replaced.

only way to be sure. I can't see under your hood, the light here sucks. good luck, chuck.