Answering my own question. Repleace with original Champion RC9YC plugs, do not upgrade to platimum. Car immediately ran great and initial hesitation was "gone".
You completely waste the injector cleaner. It has to flow through the ports which supply fuel to the engine to do its job. That's why the directions tell you to put it into the gas tank in a certain ratio to gas. It mixes with the fuel in the tank, flows through the system and out of the injector ports.
No, it has a throttle body. The throttle unit resembles a carburetor except that there is no fuel bowl, float or metering jets. The fuel is sprayed directly into the throttle bore by an injector. It's actually fuel injection, except the fuel is injected in the module beneath the air cleaner as opposed to each individual cylinder.
The 91 Caprice is throttle body injected and has 2 fuel injectors mounted above a Rochester throttle body. The easiest way to check for an injector that is not working correctly is to remove the air cleaner assembly, start the car and visually inspect the base of the injectors for a smooth consistent spray pattern. If the pattern is absent or intermittent on both injectors it may indicate a problem elsewhere, the ECM or a maybe a wiring issue or sensor. If it is a single injector that is acting up it could be the injector or a wiring problem to that injector which could be tested with a multimeter.
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