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By Ben Klayman and Bernie Woodall DETROIT (Reuters) - General Motors Co's first-quarter profit tumbled 88 percent on Thursday due to the massive recall for defective ignition switches, and shares fell 1.3 percent after the company said expectations for the rest of the year must be trimmed. While the company's results topped expectations on strong pricing for its redesigned pickup trucks in North America, it did not raise its full-year outlook by a corresponding amount. GM said in January its 2014 earnings would finish slightly higher. While leaving the outlook for the full year unchanged on Thursday, Chief Financial Officer Chuck Stevens said the stronger first quarter means the outlook for the rest of the year will have to come down.