. >> reporter: jack gillis says whether emi is at play or not finding the root cause could be a challenge. >> to discover what caused the problem is going to be a mystery that may not be solved. >> reporter: this is one mystery that millions of toyota drivers hope engineers will be able to unravel soon. >> that was lesli foster reporting. >>> good morning, everyone. you are watching 9 news now at 5:00 a.m. i'm andrea roane. angie goff will have the traffic in just a moment. right now devon lucie is in for howard bernstein and he has a look at the forecast. >> good morning. a lot rosier than yesterday. a lot of cloud cover. rains came in the afternoon and evening