check the engine's ECU. you have a bad FI control output, and there may be a spare I/O port in the ECU (unused port that the FI control can be re-directed to) if you do not want to mess with a delicate electronic port re-assignment, get where you can swap the ECU out with a known-good one, and see if the problem clears up before shelling out $440 for a new one.
before you spend alot of money on an ECU you should check your wiring , using a noid light to verify signal ,and check integrity of wiring .possible broken, chaffed or pinched wiring.
Depends on the car... If you can see the injectors, you'll need to disconnect the wiring harnesses from the injectors... (there is also usually a boot over the injector). You then need to disconnect the injector from the fuel rail. (careful not to strip the little fitting). You can then use a wrench or injector socket to remove the injector. Make sure you replace the gaskets and seals when installing the new injectors. (might need teflon tape around the pipe fitting where the injector feeds from the fuel rail).
If it is just one injector, it is a bad injector or a problem in the wiring harness or connector for that injector. If it is all of the injectors, it could be a fuse, the entire injector harness, a broken loose or unplugged connector on the injector harness, or the fuel pump or fuel pressure regulator.
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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