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Don't forget the simplest. Check fuses!
Yea have a second opinion. Ask them if they did a compression test on it. If compression is within 10% compared to other cylinders chances are its not the head.
4.0l or 5.6l both have timing chains. 3 to be exact.1 primary and 2 camshaft chaines. With Nissan"s in particular if oil changes aren't done at proper intervals and wrong viscosity the primary chain tensioner goes bad causing excessive chain slack. Very costly. Depending on shop labor $800-$1000. Parts $300-$400
On this particular engine you have to disconnect the fuel line feed into the fuel rail. A proper fuel injection pressure tester should have multiple adapters to hook up to different systems. This Chrysler doesn't have a shrader valve.
You need to check if your Optima has a transponder chip in your key. If fault in system (bad antenna ring) security thinks someone is Trying to (hotwire) car and shuts down computer. Ie no ignition or fuel. Try spraying starting fluid in air box. If car runs no fuel. Make sure when key is turned on you hear fuel pump run for about 2 seconds then stop. If not check fuel pump relay.
I agree check intake manifold for leak. Let car idle then spray carb cleaner where intake meets cylinder head and around any vacuum hoses if idle changes you found leak.
Usually if lower intake manifold is leaking from water port you'll have either steam coming out of exhaust or intetmix water in oil. And if so an additive won't work. Need to replace gaskets. Factory uses plastic ones with rubber O rings. Designed to fail.
Air impact is best. If not available use a chain wrench and a long breaker bar. Chain wrench wrapped around pully to stop crankshaft from turning. Remember (lefty loosie, rightly tighty)
If MIL light is on check codes. Possibly a bad IAC valve. Or leaking intake manifold gasket. If no MIL light try disconnecting neg. Terminal for 10 to 20 minutes. Reconnect battery start car let idle for about 5 minutes. Might help.
First, can you visually see the location of where fluid is leaking? Front caliper, brake hose (line), or fluid by rear brake drum (wheel cylinder). Possibly out of master cylinder into brake booster. If no visual leak then fluid is low due to worn pads. Most of fluid is down in brake calipers because pistons are pushed out. When new pads are installed pistons have to be compressed back which will force fluid back into reservoir