Montoya will take a 34 - point lead over Graham Rahal to the season - ending race next weekend at Sonoma Raceway .
Josef Newgarden finished second with series points leader Juan Pablo Montoya third .
leader will take a 34 - point lead over Graham Rahal to the season - ending race next weekend at Sonoma Raceway .
Josef Newgarden finished second with series points leader Juan Pablo Montoya third .