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My engine, 2001 Sonata 4cyl. (101,000) bogs when accelerating moderately from a dead stop. It's much worse when the engine is cold. So far the dealer has replaced all sensors possibly related to this issue (according to them) including Mass Air Low Sensor and Throttle Position Sensor. They have also flushed the fuel injectors and de-carboned the intake manifold and pressure checked the fuel system, changed the fuel filter, installed new plugs, wires, and coil. No problem lights during diagnostic. Now they want to change the timing belt (50,000 miles), Balance belt, Crank sensor and Crank blade. These last four items do not seem like a possible cause for the engine to bog only when accelerating and especially worse when cold. What do you guys think? Thanks