Back in the dark ages, some of us had a quick and dirty injector cleaning procedure. Remember the squeeze tool that was used to pierce a can of Freon for charging an air conditioning system? We would adapt one of those things to fit a spray can of carburetor cleaner, and attach the hose to the pressure monitoring port on a fuel injector rail. Disable the fuel injection pump, run the engine at a fast idle on straight carb/injector cleaner for the full volume of the can, and the injectors got squeaky clean. It was usually a pretty good idea to disconnect the catalytic converter to keep from poisoning the catalyst with the exhaust gas in the process.
Jerry
