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2011 Outlander Sport - hard starts

On occasion I get some hard starts with my Mitsubishi. Usually after leaving work to come home. Ive taken it to the dealer twice with no resolution. It even did it once at the dealership. Battery was tested as good. Car always starts but sometimes takes longer for it to turn over. I still have the warranty, but not sure what to have dealer check.
I find it hard to believe that a car doesn’t keep an error log for mechanics to analyze.
Thanks