Given the amount of awkwardly snappy dialogue found in “Baby Driver” (2017), I shall feel no shame in turning this review into a gearhead punfest for a film whose plot stalls out just before the checkered flag. The backstory (good kid collides head-on with bad dude) is finely tuned and the setup (one last job, girlfriend waiting for a fast getaway) is a high-octane classic, but the leaky climax is all over the road, loose in, tight out and full of knocks, pings and run-on. Not even the music, which flows like pure diesel, can jump-start this poor-handling caper flick.