UNDATED (WKOW) -- The National Highway Traffic Safety Administration is intensifying its investigation into two cars made by Toyota.
The investigation surrounds about 1.8 million Toyota Corolla and Matrix cars made between 2005 and 2007.
The agency has more than 160 complaints about the engine stalling.
Investigators are looking into problems that may have started during the cars' production.
So far, no recall has been issued.
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