What brand of plugs are you running?

[TomCoppola]

AC Delco


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[GMCTRUCKS]

NGK V Power

 

[Branwhy]

Ac delcos

 

[lha1992]

Ac delco alllll the way! Dont use autolite. When I worked at oreillys I suggested everything but autolite

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[SkyHighColorado]

I switched from acdelco standard plugs to Autolite XP and my engine runs much better. Acdelco standard plugs don't last long for me, only 30k tops they run rough after about 10k. So far I have just over 10k on the autolites and still runs flawless.

 

[96Z71ECSB]

NGK Iridium IX with NAPA brand cap, rotor, and wires.
Truck runs flawless.

 

[skylark]

Bosch glow plugs!