All of a sudden i was cruiseing along and I felt the trucks engine begin to studder....and i have a code reader so I hooked it up and found out it is cylinder #3 Missfiring. It only studders through when I let it die down to idle...like at a light....or drive it steadily at a speed where the rpms are low. Any ideas on what the issue could be.. The plugs where just changed 500km ago.

 

try replacing your coil pack on number 3

 

can i transfer coil packs around to see if the problem moves with the pack?
Also the misfire is not aparant when i start the truck up and only apears after the truck warms up.

 

I replaced the coil pack and there was no change. any other suggestions?

 

could have a bad plug. or a vacuum leak