My 2006 Nissan Titan started misfiring really bad when cranking it if running off 3 or 4 cyl. After several attempts restarting and misfiring, it would crank and run fine and drive normal. Two of these times while running 55 or 60 mph, it cut off without any misfire, noise or anything while driving. It was as if it had been just switched off. I pulled over and it restarted fine. On other attempts past few days it has been alternating good starts and misfiring starts until today. Now every start is misfiring and if you try to rev motor it cuts off.
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I forgot to mention the service engine light flashes while misfiring or whatever is causing the irractic running of engine. It cranked several times today and ran fine but when backing up in drive it just cut of with no symtoms or sounds. I have unplugged the computer harness at firewall and replaced, removed fuel line at front of rail and its pumping fuel when trying to crank and also used accutec tester about 30 or more times and it reads no diagnostic code failures each time.
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