Q: The car has trouble starting - 2001 BMW 325i

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Every after few hours I try to start my car, the car doesn't start at once to be specific it starts and after 2-4 seconds it dies back and again I try the same repeats for up to three four times and later it tries to maintain its fire in engine and I checked with a mechanic he says the fuel pump and mass air fleow sensor need to be replaced but I tried to use air flow sensor cleaner and cleaned it three day back but still the same story repeats always but I just wanna ask and confirm with you weather shall I go ahead with mechanics suggestions to replace pump and sensor as I am worried they are much costlier when I go with Bmw original parts

My car has 111000 miles.
My car has an automatic transmission.

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