I have a 1995 jeep grand Cherokee it starts fine but while you are driving it goes dead out of the blue there seems to be no reason for it, and it usually starts right back up sometimes it takes a while. it also backfires sometimes when it is in a stalled state and trying to start it. no error codes according to my mechanic. he says it can't be fixed is that true would you take it to a dealership or what thanks Jeff