Three Ohio drivers are suing Ford Motor Company, claiming its six-cylinder EcoBoost engine is defective. The lawsuit filed in Columbus says the 3.5-liter V6 EcoBoost engine can shudder, shake and rapidly lose power while drivers are trying to accelerate. It says more than 100 drivers have complained about the engine to the National Highway Traffic Safety Administration. Ford has been selling several vehicles equipped with the V6 EcoBoost since 2009. The suit claims Ford has acknowledged the problems in messages to dealers, but hasn't informed owners.