Check Engine Light

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The Check engine light in my 1992 Ford Mustang Lx Hatchback 2.3L is on, When it is on the Tach says that i am doing 500rpm at idle and when i acclerate my redline is 2800rpm so i hooked it upto my buddies scan tool and it says that i am running at normal idle. So what i am wondering is there a big problem with my mustang or can i just replace the tach and it will fix the problem Please help me

posted by  BoominMustang

Go to your local auto store or mechanic and get them to used a diagnostics tool to find out what code the check engine light is running

posted by  GonnaDie4TheGov

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