SOURCE: 2004 GMC sierra cylinder miss fire code
Have you put new sparks plugs in it. If you havent I would try them first. Only run the ac delco plugs listed for the truck. I have had many people come threw the shop with misfiring and trucks running like **** and come to find out they put bosch or ngk plugs in it. Your manual says there good for 100,000 miles but there really only good for about 75,000 or so. Also run some lucas fuel treatment or b12 chemtool. both you ad straight to the gas tank. If it calls for one can for 20 gallons buy two and double the treatment it wont hurt you engine.
Check the steel fuel line under the intake manifold
had one that was almost completely clogged shut with ****
took a month of hunting but found this to be the problem
SOURCE: 2006 ford explorer p0191 intermittent stall
P0191 Fuel Rail Pressure Sensor Circuit Range/Performance
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galletto 2
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