What was the reason the officer gave to "pull" you over? Depending on where you were "parked"- If you were parked safely off the roadway, that can be a valid legal defense.
There had to be an articulable reason for the officer to "stop" you. One charge that people can be accused is Physical Control, similar to DUI without the driving component.
Another factor is what is the timeline of the 4th DUI? Is it within a seven year period or outside? Serious concern is that the officer did not question "the other guy." You will need to get his contact information in helping you with defending your case.
You can still be charged with being in physical control of a motor vehicle. This is almost the same charge as DUI except that instead of driving they have to show that you were able to drive the care if you wanted too. There is an affirmative defense that you were safely off the roadway prior to being contacted by police.