If you disconnect the battery the PCM computer will "relearn" the fuel injector memory banks and auto trans shift memories over a few hours of driving. A trouble code will be set in PCM computer memory when the battery is reconnected, but the CEL light will not usually turn on continuously just because of that.

Techron Fuel Injector Concentrate Plus
is a good in the gas tank treatment,
as if Yamaha Ring Free.

The injector cleaning rigs that splice into the fuel lines and substitute burnable detergent for gasoline are more expensive but clean quickly.

Taking the fuel injectors out and sending them off for cleaning is typically $25 per injector but they flow test each one. Put the highest flowing injector in cylinder #7. The "catch screens" at the top of each fuel injector get replaced when this is done, probably a good thing.

Moparts members here have built their own pressurized cleaning rigs.

Some owners report that the cheap ultrasonic jewelry cleaners will clean fuel injectors.

Buy new o rings when re-installing.