I have never done anything major to my truck myself. The reason being is my uncle b!tches about anything I do to my vehicles. He thinks a few tools in the garage make it look like a service shop or something.
if you get new injector it will do it still they just make that noise why mess with the truck if there ant nothing wrong with it
my boy got a 2000 ranger 4.0 with 200000 on it he buts in a can of restore every other oil change and the thing has good comprsion throught out the hole motor