Quote Originally Posted by uglyota View Post
Does that truck have an icm of some sort? That's the first thing that comes to mind for me when I hear about misfires at low rpms that smooth out at higher ones. Coil is also a good bet...they can go out at the lower RPMs (lower voltages) but still work fine at higher RPMs...I think
humor me. . . icm (ignition control module)? I don't know if it does or not. Gonna try to convince flem to come take a look. I think I may replace the #4 coil to rule that out before tearing into the top end to check piston and headgasket.