thru the brake booster line will not clean the inside of the injectors like a dose thru the tank will.

I'd also throw about 16oz of acetone thru the tank, and I might pull the injectors and put a drop on the nozzle of each one, nozzle up, and let it sit there, plus prime the injectors with acetone (pour them full) as you install them, then crank the truck up, which will blow a fat dose thru the injector.

Not responsible for advice not taken...