Kim Kardashian and Kris Humprhies -- Reconciliation 'Up in the Air'

Kim Kardashian and Kris Humphries threw a Hail Mary Sunday ... to see if they could save their marriage -- and after a four-hour meeting with their pastor, sources close to the couple tell TMZ a reconciliation is "up in the air."

According to our sources, the meeting with Pastor Joel Johnson went well as they talked through lots of issues. We're told the two expressed respect and love for each other ... but both acknowledged a lot is wrong with their relationship.

Our sources say Kris was "ecstatic" Kim made the trip to Minnesota and he truly thinks he can win her back.

As for Kim .... she's unsure if she even wants to give it another go ... but for now, she's willing to keep talking.

Stay tuned.