Weird engine noise
Do a Compression Test....Cold/Warm
Does it idle funky, or lack acceleration power?
ALL 3 1 8's have nylon camshaft timing gears and WEAR.
I ALWAYS replace the timing chain and gear with double rollers when I own/drive 318s for this "weird noise" reason.
I also Use a Mopar Performance Timing Chain Tensioner for even more assurance.