Ideals up and down when parked

This could be a vacuum leak. Check under the hood for broken vacuum lines or hoses. If you don't work on cars then use this link to find a good shop near you. https://repairpal.com/repair-shops Alex

Sounds like a possible air intake concern, vacuum leak, or something related in that area of engine performance. Testing with a diagnostic tool is helpful.

Sounds kinda crazy but make SURE engine coolant level is FULL..