Q: Idling and dashboard lights

asked by on February 22, 2017

Just had a JDM engine swap done. The car runs wonderful and smooth. However at a light or stop the idle will start out fine but then hesitate a little or act like it might want to stall. In park it doesn't do it. Also I noticed yesterday a few interior dash lights dimming or flickering. Specifically the temperature knob, air circulation and rear defrost button lights. I went to have my battery tested and they told me the battery needed to be charged. That's it for now. The alternator is brand new and tested fine.

My car has 208000 miles.
My car has an automatic transmission.

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