CORRECT answer is option 1.The part mentioned in option 1 contains an error.SELDOM means 'very rarely' and 'stalls' means 'stops RUNNING, typically because of an overload on the engine'.The speaker wants to say that it is very rare that his car stops.The APPROPRIATE phrase to be used here is 'seldom if EVER/seldom or never' and not 'seldom or ever'. Both the phrases mean 'very rarely'. Correct sentence - My car has a habit of spluttering occasionally but it seldom if ever stalls.