Just purchased this car from a local lexus dealer it has 54,000 miles. My question is when the engine is cold there is a random clattering noise that comes and goes is this normal it almost sounds like a pulley or something , the lexus dealer thought it was one of the front engine shocks so they replaced one of them and he thought it fixed the problem but the next day I started it it was doing the samething I want to make sure it is not engine related does anybody have any ideas the car has all the sceduled maintenance done to it.

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84 300 Turbo / 320,000
96 E300 D / 55,000