my truck spudders on acceleration in 3rd & 4th gear. I've replaced all the plugs and wires but not the coil packs. Starts up just fine and doesn't act up while idling. I was going to check the ground and connections to make sure they are corroded. any other suggestions would be great help
Take the old coil pack to an auto parts store and have them bench test it before you spend more money on parts. Also, you indicated that you have a trouble code. Post it here and we can be of more help to you.