Four of the biggest sellers of cars and trucks in the United States said Friday that their sales had plunged recently, reflecting the intense squeeze that a global semiconductor shortage has put on auto production.General Motors, Honda, Nissan and Stellantis reported significant declines in sales in the three months that ended in September — in G.M.’s case, a drop of one-third from a year earlier — as chip shortages forced them to idle plants, leaving dealers with few vehicles to offer customers.Toyota had a slight increase for the quarter, but its sales in September fell sharply after it …
