Hey guys I've got an '02 GMC with an injector out of it. I'm a diesel mechanic by trade but spend all my time working on older, bigger stuff in dozers, off road trucks, and scrapers. My local diesel shop diagnosed it and i just need a heads-up on what to expect when changing it out. This is the engine that you have to pull the valve cover off of to change injectors... right? Advice would be appreciated