My dad thinks he over torqued it heh...because before the plug change everything was fine...so he knows to use a torque wrench next time. He did it by hand just like you.

 

Gotcha, glad you figured out what caused it and was able to easily fix it.

I can tell you when I measured 11 foot pounds on a torque wrench and then tried with my hand I could easily have tightened another 3/4-1 full turn.
its way lighter then what intuitively feels good when tightening something down.

Most men want to tighten things down so they won't move until Jesus returns, but with spark plugs I have to remind myself this is bad.
Enjoy your weekend and now smooth idling truck.
Danny

 

I sit corrected: http://www.upmpg.com/tech_articles/motoroil_viscosity/

The viscosity is the second number in 5w30. So we want 5w20. I wouldn't change. The 5 is tested in Winter and the second number is tested at 210 degrees if I read this correctly...this time.

 

Haha yeah that's the same way my dad thinks and thanks!