2003 Dodge Ram 1500 Quad Cab, 4.7l

My Truck Is Hard To Start, Runs Like It Is Flooded And My Gas Millage Has Gone From 16 Mpg To 10 Mpg. I Have Changed Spark Plugs, Cleaned The Throtel Body And Hooked It To The Computer But No Codes Show Up. Please Help If You Can.

  FISHSURVEY1