After coming to a stop cars rpm's drop below 1,000 and sputters

2011 SCION TC
125,000 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC
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JTUTTLE
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okay, car starts up fine an sits there idling fine, once i pull out go down the road come to a stop cars rpm's drop below 1,000 and sputters. then it starts working its way back up to the 1,000 rpm's.. also noticed at night headlights go real dim at red light give gas they get brighter. i was thinking alternator.
May 15, 2019 at 5:51 PM
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DANNY L
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Hello, I'm Danny.

If you remove the alternator and take it to your local auto parts store they will test it for free.I would also take your battery as well to be load tested.Here are a few tutorials showing what is involved:

https://www.2carpros.com/articles/car-battery-load-test

https://www.2carpros.com/articles/how-to-check-a-car-alternator

https://www.2carpros.com/articles/how-to-replace-an-alternator

Hope this helps and thanks for using 2CarPros.
Danny-
May 15, 2019 at 6:46 PM