I have an 01' 5 speed all stock. When putting the clutch in to come to a stop the engine will drop to idle as it should but then will surge up and down maybe 100 rpm for a few seconds and then level off to a steady idle. What would cause this?

 

normal, it takes abit of time for all the electronic sensors to synch.

 

Been driving this truck from day one and it just started doing this.

 

mine started doing that very same thing when i installed stage 2 injectors, one source suggested i had some air in the system.
i don't think so
it did it before i removed the same injectors 2 years ago.
so i think it is injector related...... did not do it with stage 3's or 275's

 

check your fuel psi, mine is a auto but it had a rough idle because the lift pump was going out.

 

I've had the same problem with my 01 5 spd. I've got my fuel pressure gauge setup down stream of the filter and have been showing 12-16psi to the injection pump. The thing that throws me is that mine is intermittent. So far I can't tell what sets it off... I'm up in Alaska and at first I thought it was cold temps but it was in the 70's last week and it would still do it sometimes. I plugged in my code reader and nothing showed up... I'm still at a loss.