I swear by BG products.
There are two basic treatments for the intake/fuel system.
What you did already is an induction, or plenum service. That will clean out any oil and carbon build up from the top of the engine, throttle body, intake runners, but the chemical is not aggressive enough to do much to the baked on carbon that you get on the intake valves and inside the combustion chamber, and it does not do anything for the injectors. For that you will need to do a fuel injection service, where you hook up to the fuel rail, and run a different chemical through, run the engine off of it as opposed to gas.
The adapter that you will need from BG is #46, should be able to get in touch with a local BG rep that can get it for you, or talk to a shop that has a rep, and see if they can by it for you, and you pay them, obviously a slightly higher price then what they paid. Also, when doing pretty much any BG service, you want the vehicle at operating temperature, so I would recommend disabling the fuel system(with it cold) hooking up the machine to do the injection service, but running just gas through it a couple times to let everything get hot. Then do the service. When doing this, do not let the car stall out, it floods pretty easily, so as soon as you feel it starting to bog down due to low fuel, shut it off, and refill. When doing the injection service, you need to do throttle sweeps, like with the induction, but much slower, and no need to really go much above 3500, it's mainly to allow for a little more air to go through the system, and allow the injectors pulse to vary to fully clean them out.
The injection service uses a very aggressive chemical in order to clean all the build up away, but in doing so, it can also wear the plating on the spark plugs, if they're close to the service limit. I usually recommend a full tune up along with this service, and definitely an oil change afterwards, as the chemicals you're feeding through the engine are designed to break down oil.
I have not done an induction, and then later an injection, so I can not really say you'll feel much more, however, I have done induction instead of injection, and the injection service does provide even better results. However, the injection service that I preform, includes an induction.
Do you mean the engine oil flush?
If so, yeah, I've used it, it works well, but the AJ engine doesn't really sludge up very often, so I'm not sure what all will be accomplished. If just for sake of a little extra cleaning, go for it. I also very much like, and use on my personal vehicles, BG MOA with every oil change.