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The gears for the timing chain can strip, causing the engine to crank but not start.
Tubes for the EGR system (exhaust gas recirculation) can break, causing an exhaust leak and noise under the hood.
Rough or unstable idling could be caused by the idle control valve and throttle plate being plugged with carbon.
MAP (manifold absolute pressure) sensor failure is common and the MAP sensor hose to the intake port commonly plugs up or breaks, which can cause unstable idle conditions.