BOSTON – The Islanders can take a lead. They just can’t keep a lead. And, to paraphrase noted philosopher Jerry Seinfeld, that’s really the most important part of taking a lead.

The Islanders mishandled a two-goal lead for the second straight time to start this four-game road trip, losing, 5-2, to the struggling Bruins on Tuesday night at TD Garden.

The Islanders (4-4-1) also scored the first two goals in Saturday’s 4-3 shootout loss to the Flyers.

This time, they went 0-for-5 on the power play, failing to capitalize on a four-minute advantage that ended the second period and started the third.

The Bruins (5-7-0), who entered the match in a 1-7-0 skid, meanwhile were 2-of-4 as Ilya Sorokin (17 saves) gave up four or more goals for the fifth time in seven starts.

Tuesday’s match was a

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