signs of a bad injector please help new to this

[tony4mitchell]

i thing my injector might be bad when i start the truck up in the morning and take off when i hit 40mph the engine will start to shake and when you step on the gas it go away when the truck warm up it dors not do it but the rmp well move a little bit

[jesilvas]

That's a big thing to start at. Could be a loose UVCH making intermittent connection making it seem as though it's missing. U joint. Trans. Diff. Drive shaft. Could be the EBPV closing when cold like it should. You could unplug it from the base of the pedestal and see if it stops.
I replied to your other one.