So my car sometimes revs up high when parked then revs down never had this happen to me also when parked sometimes it seems like my car battery isn't charging lights dim in n out then when I rev my car it stops everything dealing with the battery is new optimum battery new alternator new battery posts new belt car only has 139,000 miles

 

Sounds like connection issue? Who installed the alternator?

 

Is this the same alternator/ battery setup that you were having issues with back in October 2021 as evidenced by your other posts?

Are the lights flickering at idle? In other words, while sitting still with the engine idling, do the interior lights flicker? Or, do them go dim and when you blip the throttle they go bight again?