Forgot to put my oil cap back on.

Matthew, Vacuum hose diagram should be under hood on a decal/label, on hood it self or on rad cradle usually. Check the attached links,instruction and guides, Good luck
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I would replace the engine and transmission mounts, they are hard and transmitting engine vibration to the chassis.

It COULD be just a simple tentioner getting tight but cant say without hearing it.

look under the car for oil leaks low oil will damage the engine

if it's getting hot also [ i guess if its getting hot it should be leaking out the overflow tube] i would think it's a worn radiator cap or check the oil for water in it [look on dipstick for cloudy looking oil] blown headgasket.
radiator cap easy fix.
blown headgasket, mechanics expensive fix

where on the engine did u take it out from is it a vac hose or oil hose big or small

Uhh there are no rods in the head. That dealer has a loose rod in his head maybe.
The crank, rods and pistons are all in the bottom end of the engine.
What it likely is is either a broken piston skirt or a spun rod bearing.
Spun crank bearings are rare and sound deep.
A spun rod bearing can be fairly quiet on idle depending how bad it is worn out, but it will be really loud on acceleration. Piston slap from a broken skirt can be pretty loud too but it mostly sounds like diesel rattle only a bit less. Some have described it as a loud pinging sound like detonation.
Drain the oil and check for metal debri. If you can tilt the vehicle a bit for the oil to drain more towards the drain hole that could help. Then look for metal pieces and judge their size. There should be NO glitter whatsoever in engine oil, or any kind of debri. Now a rear end or transmission is different. Those always have a little metalic sheen to them.
Best of luck.

timing belts should be checked every 20,000 miles and replaced every 50,000 but sounds like you need a new thermostat and your valves are going bad

Rattling? I would think what you hear is valve noise. The car will always have inherent metal on metal sounds when open to the air. If you think its out of the normal then take it to a shop you trust.

check your engine and battery ground wires and the fuze links.