By Mike Spector and David Shepardson NEW YORK/WASHINGTON (Reuters) – The U.S. business of Fiat Chrysler Automobiles has agreed to plead guilty to criminal conduct and pay roughly $300 million in penalties to resolve a multi-year emissions fraud probe surrounding vehicles with diesel engines, people familiar with the matter said. FCA US LLC, now part of Stellantis NV, has agreed to plead guilty to a criminal conspiracy charge arising from its efforts to evade emissions requirements for more than 100,000 older Ram pickup trucks and Jeep sport-utility vehicles in its U.S. lineup, the people said….