Throttle issue 04 lb7
I have a 2004 lb7 with 257k miles. I just purchased it a few months ago and just got done putting this 257k mile motor in it. When I am driving or just raise the rpms and let off, the rpms tend to drop down below the normal amount and then it revs back up a little higher than normal. Then it returns to normal idle. I did notice the fuel lines look smushed but I was told that's normal on these trucks. I plan to replace that before I put license on the truck and get it on the road. Don't want to starve her of fuel. Any clue what my rpm issue might be?