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Discussion Starter #1
I have a 2003 Trailblazer LTZ with 209K on it that seems to surge down in power when I’m just idling or have the AC on. It idles a bit high when starting as well but it calms down after a few seconds.

I just replaced the battery, starter and put new plugs in and replaced a coil pack that had gone bad. I had Farm & Fleet test my alternator and they said it checked out.

I was going to clean the throttle body to see if that changes anything.

I’m kind of at a loss here and not sure what to do next.

Thank you in advance!
 

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Discussion Starter #3
What "power" are talking about, engine or battery?
I can watch my gauges and hear the engine start to almost die and then it catches it self and everything goes back up to normal.

It does something similar when I go to shift the car into drive when I start it up for the day.

Driving down the road it seems fine, I’ve had the car since 2017 so I know what it should sound like and how she runs.
 
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