Starts up with a small miss like perhaps spark plug. With in two minutes it bucks so bad I have to shut it down. New plug wires, cleaned MAF sensor, IAC valve seems to be functioning, changed fuel filter. Someone suggested Sea Foam but having bought the truck new and only 20,000 mi. on it I hate to foul a set of plugs.(over warranty by 6 mos.) Was able to get it to Auto Zone half block away but scanner was useless as no CEL. Hate to be crying like a little girl but close to being stranded-in Ohio, no less.