When i go out to warm up the truck in the mornings and crank it up it idles kinda strange... smooth but erratically it jumps a little.. not much only about 50 rpms or so but its just as if the fuel pedal had been tapped... After a while it smooths out and it doesnt do it anymore... normal??
-thanks, A.Wall

 

When that is happening look at your charge hand (volts). If you notice the sound change when the hand (Volts) drops back a bit its the grid heaters cycling and its the alternator that's pulling down the rpms. That's why after it warms a bit it stops because the grids shut off.

 

ok thanks, thats what i thought i just wanted a 2nd opinion