injector tube pulse?
 

Just wondering what might cause it or if its normal because that tube comes right out of the end of the rail where the others come out the sides. I noticed that the #1 injector tube I can feel pulsing if I touch the tube while the truck is running but I cant feel it in any of the other tubes. The truck is completely stock and is not down on power, no codes, fuel mileage is the same but it seems like there is less smoke then before.

your feeling the #1 injector firing probably can feel it on that line because its longer so its not as stiff.

X2. All the other lines have hold downs on them besides 1

Thanks for the replys. I figured it was the injector firing but thought it was weird I could only feel the one but that makes sense.