I would suspect a leaking water pump, if I remember correctly it is mounted right in front of the timing cover and if it is leaking from the back the water will find it's way out somehow.
your main oil seal on the rear of engine is leaking or the timing cover seal is leaking,
Noise coming from the area of the chain and in severe cases it will jump a tooth and the engine will run very badly with no power.
overfueling, ignition/valve timing out, or hopefully just air leaking through knackered exhaust gasket into pipe, all causing secondary combustion.
Head gasket, timing cover gasket, or hose leaking.
its having its period
Bad points , leaking or fryed coil, shorted wires leading to timing device.
A Dodge Durango does not have a timing belt. It has timing chain. If the timing cover chain gasket is leaking it is normal to change it while changing the water pump.
Head gasket is leaking
Possible cause is a leaking head gasket or timing chain gasket if the water pump mounts to the timing chain like on a ford 302 cid You probably are leaking into the crankcase through the headgasket. There is a slight possibility that the block is cracked.