That motor should be pretty decent on the compression numbers it's a higher compression engine ( 9.7:1 ) so your numbers should be in the 170's imo . You either have a worn out motor or blown headgasket/warped head. With one cylinder in the 170's I would bet a blown headgasket/warped head.

if it's a blown headgasket, sounds like a good case for some blue devil...that stuff rocks . Have yet to see a hole it won't fill up. Used it on an explorer with a blown head gasket so bad water was running out the tailpipe. after using that blue stuff it sealed right up and ran like a kitten, dunno how long it lasted though it was a cash for clunker trade-in for a customer .