Today my college age daughter was driving home for spring break on I70 thru MO. Vehicle is a 2004 Grand Cherokee V8 with almost 100k on it. After about 90 minutes of driving on the interstate, the thing just died. No warning, no stumbling.. just quit. After about 30 minutes, it refired and she drove it another 45 minutes or so.... it did it again. She nursed the jeep to Columbia MO to the Jeep dealer there. They ran a diagnostics on it and it came up clean........ no codes. She got a hotel for the night and the dealer will take it for a drive in the morning to see if they can replicate the problem. Without it throwning any codes, where should the dealer be looking? and thanks!