AUBURN HILLS (WKZO) -- Chrysler may invest 198-million dollars into its Mack Avenue Engine Plant in Detroit.  If the proposed investment becomes a reality that would mean the creation of 250 new jobs.  The plant would build the company's new Pentastar engine, which will replace the soon-to-be discontinued 3.7-liter V-6 engine for the Ram 15-hundred and Jeep Liberty.