U.S. safety regulators will investigate problems with stalling or surging engines in nearly 725,000 Ford cars and SUVs.
The probe affects Ford Escape and Mercury Mariner SUVs and Ford Fusion and Mercury Milan sedans from the 2009 through 2011 model years.
The National Highway Traffic Safety Administration reports that the vehicles can unexpectedly go into "limp home mode" at reduced power. The agency and Ford have received almost 1,500 complaints about the problem. There were three crashes and one injury.
The cars and SUVs have not been recalled yet, but the investigation could lead to that action and consumers would be notified.