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#4 cyl @ idle is dead 900 92

I have a 940GLE - 230F engine. #4 cylinder is not operational at idle, usually when the engine is warm. I changed spark plugs, wires and dist. cap. I also checked resistance @ control unit (4.3ohms). Also each injector individually read (5.3ohms). At high RPM the engine runs fine and is within normal parameters. However when I stop at a light it runs as a diesel engine, in gear or not. I heard that injectors are a rare failure, are reliable. Is there anything else I should check before chenging the injector? Will that fix the problem? Thank you in advance for any helpful tips.






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