spark plugs expert help!!

[dydu]

Lately my truck start to misfire real bad , so i pulled the plugs and for me they all looks the same but maybe someone can tell me something more what is going on down there? they are denso it22 and they are gapped at 0.35, the truck has 6lb pully and pretty much every bolt on. Thanks in advance for any input.
passenger side


driver side

 

[The Swede]

Its really hard to tell by the pictures, but i think its time to change.

 

[dydu]

Its really hard to tell by the pictures, but i think its time to change.

Believe me or not , but they have maybe 800-900 miles. the truck is breaking up real bad (like firing on 7 cylinders) so first thought was COPs or plugs, but i know :??: how to read plugs so i figured maybe someone can help me out?
thanks

 

[Robert Francis]

Those Denso's look a lot like mine that I pulled after about 6000 miles. The insulator looks "reddish" - mine looked like that after using NOS Octane additive to the fuel and mine were gapped at .034. But I never had any "misfire" issues.