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You need to have the pcm scanned for fault codes. If it is newer than a 1996 model, Autozone will scan it for free and tell you the fault codes. A mechanic would go from there, based on what the codes reveal. The low idle is probably a symptom of the fault.
Anytime the MIL light stays on with the engine running, the pcm (engine computer) has detected a fault and will turn the light on. It also stores a trouble code in memory, maybe called a pending code if only recently started, but the code can be found with a hand held scanner, hooked up to the port under the dash for code retrieval.
When you have done the repairs, and the old codes erased, you will see that the engine light always turns on when the key is turned on. If there are no more problems , the light will go out very quickly after the engine is running. It is a bulb and computer check that the light is on with key on, and stays on until the engine is started.
Most likely a bad or low battery or bad connection or bad solenoid or starter or combination of any of them. Those lights will mostly stay on till the engine cranks before going off.
You may have turned it on ... as in to stay on ... this light normally will stay on for a couple minutes allowing you to get out and away from the car with light ... If you turned it on to stay on ... turn it off.
vsc shuts down any time check engine light comes on. repair engine light problem, reset computer monitoring system and vsc light will go off. must scan computer to pull codes for check engine light and go from there.
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