Truck is stock, except Gotts mod, 170K

Spark plugs were just changed for the second time (I bought the truck new)

For a while it has been bucking and kicking when cold, but only after sitting overnight and being completely cold

I've been replacing coil packs 1 at a time as they throw codes and tell me which one it is. This time all I got was P0174 without a coil pack code.

I have buddy that thinks its the coolant temp sensor...anyone have this be the cause?

 

Update...

On the way to work this morning, same thing. CEL flashing then finally threw a code, stopped at the gas station, turned the truck off. When I restarted it, it ran fine. Went to my buddies and the code was P0174 and a misfire on #7. Cleared the codes, drove to work and no CEL and the truck ran fine.

While looking at the live data, it said at idle Calc Load was 38%.....anyone know anything about that or what it should be? Just seems off.

 

Nobody has any ideas?